Python Regex Remove Newline

Replace can act upon spaces. The browser might display these if for example a page is encoded in latin-1 but it claims to be utf-8, so the byte stream will contain byte sequences that can't be decoded into unicode code point. x, the special re sequence '\s' matches Unicode whitespace characters including [ \t\n\r\f\v]. No lines are printed by default due to the -n option. text = I'm a really good aaaaaa eeeeer jjjjj llll bb I couldn't figure out what regex I could use so I can remove these words completely. How do I use the grep command with regular expressions on a Linux and Unix-like operating systems? How do I use grep and regular expressions to search for text/ words in Linux? Linux comes with GNU grep, which supports extended regular expressions. python regex - replace newline (\n) to something else Browse other questions tagged python regex or ask your own question. For example, if your text contains the number 13487889 and you search using the regular expression (8)7\1\1, "8788" is found. It allows you to be lazy. There many other better ways to parse BLAST output in. Regular Expressions (Regex) Character Classes Cheat Sheet new line, vertical tab, form feed, carriage return, or space Regex Cheat Sheet. Any subpattern inside a pair of parentheses will be captured as a group. You can do this with a compiled regular expression using the re module if you need performance, but for clarity, and to point out the existence of [code]string. I wish to programatically remove all of these and return the string into a giant blob of characters. It is highly recommended if you have a lot of data to analyze. com THE WORLD'S LARGEST WEB DEVELOPER SITE. His key id EA5BBD71 was used to sign all other Python 2. The explanation of this technique is: first we split the string on spaces no parameters for split is by default space. Now in Python, you can use p. Excluding Matches With Regular Expressions Here's an interesting regex problem : I seem to have stumbled upon a puzzle that evidently is not new, but for which no (simple) solution has yet been found. By the end of the tutorial, we’ll have some familiarity with how Python regex works, and be able to use its basic patterns and the functions provided by Python’s regex moduke, called re, for string analysis. split REGEX, STRING will split the STRING at every match of the REGEX. You can see the using of a separator, dictionaries, split only on first separator or how to treat consecutive separators. Regular Expression Modifiers. Parameters: Regex. Removes comments. How do I match everything before a string with a RegEx. A regular expression is a special sequence of characters that helps you match or find other strings or sets of strings, using a specialized syntax held in a pattern. Python tutorial and training course for people learning Python. librxvm is a Regular eXpression Virtual Machine. The ability to write short programs that are just as powerful as a program written in another language designed to do the same thing. The following are code examples for showing how to use re. How to remove a newline from the end of a string. raw download clone embed report print Python 5. The regular expression uses ‘\s+’ for word separator which matches both spaces and newlines. Regular expressions were invented by computer programmers, who call them nasty names to this day. [:alpha:]. Any function that manipulates string value returns a new string and we have to explicitly assign it to the string, otherwise, the string value won’t change. Replace, Merge Multiple Spaces This C# example program shows how to remove multiple spaces in strings with Regex. In this article we have explained important string manipulation with set of examples. You opened the file for writing which is equivalent to a bash script that uses “>” [code]With open("file. This powerful program enables you to instantly find and replace words and phrases across multiple files and folders. A regular expression (or RE) specifies a set of strings that matches it; the functions in this module let you check if a particular string matches a given regular expression (or if a given regular expression matches a particular string, which comes down to the same thing). This article aims to outline all of the key points of Python programming language. In most engines, the character class only matches digits 0 or 1. The regular expression pattern for which the Matches(String, Int32) method searches is defined by the call to one of the Regex class constructors. A plain string is a regular expression that matches the string exactly. Regular Expression to works for multiline strings, single-line strings, and escaped quotes inside of strings python strings Regex Tester isn't optimized for. The *for* construct -- for var in list-- is an easy way to look at each element in a list (or other collection). Sometimes they even have a function called trim to remove white-spaces from both ends of a string. While this library isn't completely PCRE compatible, it supports the majority of common use cases for regular expressions. CentOS Linux 4 The operating system installed on the system is CentOS Linux 4. Often a bunch of string operations will do the job faster. In this case, $0 is the default target string. Step 6: Remove all newline characters using Extended search mode, replacing them with a unique string of text that we will use as a signpost for redundant data later in RegEx. For example: >>> "Hello people". 7/22/2014VYBHAVA TECHNOLOGIES 1 2. There are many operations that can be performed with string which makes it one of the most used datatypes in Python. and the results I wanted a lot of new lines replaced with one or two new lines such as comments in the facebook. r'\n' would be '\' and 'n'). You opened the file for writing which is equivalent to a bash script that uses “>” [code]With open("file. The constructor of the regular expression object, for example, new RegExp('ab+c'), provides runtime compilation of the regular expression. Enter your messy, minified, or obfuscated SQL into the field above to have it cleaned up and made pretty. It indicates the result of readline is unambiguous. The best known example is UNIX grep, a program to search files for lines that match certain pattern. This tutorial provides a gentle introduction to regular expressions illustrated with examples from language processing. Among the chosen few are. Performs the following: Removes docstrings. This opens up a vast variety of applications in all of the sub-domains under Python. org! Boost provides free peer-reviewed portable C++ source libraries. Regular Expression Flags; i: Ignore case: m ^ and $ match start and end of line: s. In practice, this can be used to extract. See also Any White-Space Except Newline. Do not try to use regular expressions everywhere. Double Quotes and Regular Expressions Double quotes around a string are used to specify a regular expression search (compatible with Perl 5. Strings are scalar as we mentioned previously. Python Regex Cheatsheet. My target is to keep the information short, relevant and focus on the most important topics which are absolutely. split REGEX, STRING, LIMIT where LIMIT is a positive number. If you are new to regular expressions, some of these cases may not be so obvious at first. The next column, "Legend", explains what the element means (or encodes) in the regex syntax. ) In the default mode, this matches any character except a newline ^ (Caret. Line breaks in text are generally represented as:. Remove consecutive spaces with split and join. strip() to remove the whitespaces from beginning and end). It allows you to be lazy. ^ matches the start of a new line. Lesson 9: All this whitespace When dealing with real-world input, such as log files and even user input, it's difficult not to encounter whitespace. However, when the regex gets more complicated, and I want to save the utility in a script, that perl or python suite me better. x Docs Python 2. The only significant features missing from Python's regex syntax are atomic grouping, possessive quantifiers, and Unicode properties. But I had to browse several stack overflow threads to get the information. If the optional argument count is given, only the first count occurrences are replaced. Regex in Python to put spaces between words starting with capital letters Given an array of characters, which is basically a sentence. The D removes the first line from the pattern space (up until the first newline), readying it for the next cycle. translate(None, string. Regular expressions use two types of characters: a) Meta characters: As the name suggests, these characters have a special meaning, similar to * in wild card. The solution is to use Python's raw string notation for regular expressions; backslashes are not handled in any special way in a string literal prefixed with 'r', so r"\n" is a two-character string containing '\' and 'n', while "\n" is a one-character string containing a newline. What is happening, is that call is translating the newline character into the literal "\n". Remove everything before the colon character (regex) in ms word 9 Tab ^11 New line ^12 Page OR. The string class has a method replace that can be used to replace substrings in a string. Python String Operations. The tables are meant to serve as an accelerated regex course, and they are meant to be read slowly, one line at a time. argv property returns the list of command line arguments passed to a Python script. I have a text/csv file that looks like this: I wanted to remove all the blank new lines. Ian Rolfe's Journal. Regular expressions as a concept is not exclusive to Python at all. Regular Expression Flags; i: Ignore case: m ^ and $ match start and end of line: s. Python Reference Python Overview Python Built-in Functions Python String Methods Python List Methods Python Dictionary Methods Python Tuple Methods Python Set Methods Python File Methods Python Keywords Module Reference Random Module Requests Module Python How To Remove List Duplicates Reverse a String Python Examples. Well, a couple things: First off, using str() on a list is not really what you want to do. Regular expressions are widely used in UNIX world. Char objects that represent a string. Regular expressions allow us to not just match text but also to extract information for further processing. Regular expressions are notoriously hard to read, especially if you’re not familiar with the obscure syntax. replace("e", "") "Hllo popl" If you want to remove multiple characters from a string in a single line, it's better to use regular expressions. 2012-10-25 18:42 Paul Ramsey * [r10561] Use double alignment property to remove memcpy from wkb generation 2012-10-25 18:29 Paul Ramsey * [r10560] Remove TODO note: the storage is now double aligned 2012-10-25 17:47 Paul Ramsey * [r10559] Change the gbox calculation for geodetic edges to use 3-space geometry instead of lots of transcendental. b) Literals (like a,b,1,2…) In Python, we have module "re" that helps with regular expressions. Which is the main difference to the next approach. In this article we have explained important string manipulation with set of examples. A collaborative learning platform for software developers. By the end of the tutorial, we’ll have some familiarity with how Python regex works, and be able to use its basic patterns and the functions provided by Python’s regex moduke, called re, for string analysis. From validating email addresses to performing complex code refactors, regular expressions have a wide range of uses and are an essential entry in any software engineer's toolbox. Work out which python you are running. What header line from what file? It may depend what kind of file it is, and how it is going to be processed. Joins multiline pairs of parentheses, braces, and brackets (and removes extraneous whitespace within). * = zero or more of anything but newline \S = anything except a whitespace (newline, tab, space) Toggle navigation RegEx Testing From Dan's Tools. – nmpeterson Aug 6 '14 at 19:50. Binary Number [^\D2-9]+ This is the same idea as the regex above to match alphanumeric characters. (For more information, see Backreferences. Replace can act upon spaces. That is useful if the newlines are needed, or as a temporary change to help understand some text. You can represent a newline in a quoted string in elisp as "\n". Remove Space in Python - (strip Leading, Trailing, Duplicate spaces in string) Remove space in python string / strip space in python string : In this Tutorial we will learn how to remove or strip leading , trailing and duplicate spaces in python with lstrip() , rstrip() and strip() Function with an example for each. How can I remove a trailing newline?. For an example, see Perform Case-Insensitive Regular Expression Match. I am looking for a way to remove these from my text sentence. Example file. Python RegEx: Regular Expressions can be used to search, edit and manipulate text. Regex Match Problem. If the search is successful, search() returns a match object or None otherwise. When working with 100+ columns it becomes very cumbersome. GRegex normally treats. Line Break Characters The tutorial page about the dot already discussed which characters are seen as line break characters by the various regex flavors. findall() Now you'll get a chance to write some regular expressions to match digits, strings and non-alphanumeric characters. 4 allows remote attackers to cause a denial of service (segmentation fault) via a crafted message. Learn more about Teams. The chomp() function will remove (usually) any newline character from the end of a string. Available In: 1. Python Exercises, Practice and Solution: Write a Python program to remove newline characters from a file. Regex Tester Test regular expressions with real-time highlighting. Kuchling November 23, 2000 [email protected] There is no special additional regexp-specific syntax for this -- you just use a newline, exactly like any other literal character. The + operator does this in Python. 1 server, needed for regress 2014-07-30 09:44 strk * [TRAVIS] Remove more postgresql item not in the 9. A String object is a sequential collection of System. Minimizes code indentation. Strings are scalar as we mentioned previously. Anybody has some good idea about this?. Each Base64 digit represents exactly 6 bits of data. Regular expressions use two types of characters: a) Meta characters: As the name suggests, these characters have a special meaning, similar to * in wild card. How to use regular expressions in Notepad++ (tutorial) In case you have the plugins installed, try Ctrl+R or in the TextFX -> TextFX Quick -> Find/Replace to get a sophisticated dialogue including a drop down for regular expressions and multi line search/replace. Option Description Syntax Restrictions; i: Case insensitivity to match upper and lower cases. This chapter will explain how to remove spaces, newline, tab, carriage return, digits etc from a string. Advance Python 2. split() and re. This is my regex: [\n+\s+]$ Actually, even simplifying it to [\n] or [\r\n] is not matching any newlines! What might be the cause of this? Note that I am not entering the regex in Python code, I am entering it in a regex-supporting Find/Replace. But HTML tags themselves are sometimes not helpful when processing text. \$\begingroup\$ @Mike: Ok, but in your example I don't see any reference to newlines, did you mean that semicolon should signify newlines? Anyway, there is no "fast" way of splitting lines. These functions are throw-away functions, i. @ scan till you see this character [w. Now in Python, you can use p. function Remove-StringSpecialCharacter {<#. replace("e", "") "Hllo popl" If you want to remove multiple characters from a string in a single line, it's better to use regular expressions. Python Exercises, Practice and Solution: Write a Python program to remove newline characters from a file. R Regular Expression. For more information about the elements that can form a regular expression pattern, see Regular Expression Language - Quick Reference. 3 documentation; In re. NET regular expression tester with real-time highlighting and detailed results output. I am trying to export a list of all our domain accounts but after. This feature is not available right now. SYNOPSIS This function will remove the special character from a string. ruby: match is a method of both Regexp and String so can match with both. I am building a regex to filter out any substrings beginning with '#' or '@'. w3schools. Here is the complete solution in Python: [code]#!/usr/bin/python import re with open( 't. GUI Programming in Python. Carsten Haese The codepoint 0xFFFD is the so-called 'REPLACEMENT CHARACTER'. Just paste your text in the form below, press Remove All Spaces button, and you get a single string back with no spaces. Python Regex Cheatsheet. Allows the regex to match the number if it appears at the beginning of a line, with no characters before it. It prevents the regex from matching characters before or after the number. The applications for regular expressions are wide-spread, but they are fairly complex, so when contemplating using a regex for a certain task, think about alternatives, and come to regexes as a last resort. My target is to keep the information short, relevant and focus on the most important topics which are absolutely. The rest of the code iterates through the line (or string) that was given to find matches in using the tok_regex expression and yields the token value that includes the kind (or type) of the match found and the value (represented as value. Besides, string methods like find(), rfind() or startwith() are very fast, much faster than regular expressions. Speaking more seriously, regular expressions (or regexps for short) are tools used to manipulate text and data. For example: >>> "Hello people". This article aims to outline all of the key points of Python programming language. We can use this method to replace characters we want to remove with an empty string. XXXXXXXX is the string that the text has to end with. In this case, $0 is the default target string. Learn more about Teams. punctuation) [/code]I prefer using Regular Expressions though as they easy to maintain and also easier to understand (if someone else is reading your code) [code]. GUI Programming in Python. Understanding Python Regex (concatenation, alternation, and repetition) and how to use the Python re module to match strings and byte sequences to a regular expression. In Python 3. This Python 3 tutorial covers how to read CSV data in from a file and then use it in Python. Practicing regular expressions: re. We can use this method to replace characters we want to remove with an empty string. If you are new to regular expressions, some of these cases may not be so obvious at first. Greed, in regular expression context, describes the number of characters which will be matched (often also stated as "consumed") by a variable length portion of a regular expression – a token or group followed by a quantifier, which specifies a number (or range of numbers) of tokens. I tried r'\n', but it didn't work. Within a bracket expression, a range expression consists of two characters separated by a hyphen. Each expression can contain characters, metacharacters, operators, tokens, and flags that specify patterns to match in str. Speaking more seriously, regular expressions (or regexps for short) are tools used to manipulate text and data. R Regular Expression. Use the Regex class and Regex. This free regular expression tester lets you test your regular expressions against any entry of your choice and clearly highlights all matches. 1) aaaaae (you will have one another character at the end) 2) brrrrrr (another character at the beginning). The bytes object will fulfil the role of a byte container. LINUX GAZETTE November 2002, Issue 84 Published by Linux Journal Front Page | Back Issues | FAQ | Mirrors The Answer Gang knowledge base (your Linux questions here!). 3 documentation; In re. The reason we say usually is that it actually removes any character that matches the current value of $/ (the input record separator), and $/ defaults to a newline. Welcome to Boost. 2012-09-28 22:51 pramsey * Remove unused point in poly function 2012-09-28 22:48 pramsey * Add ptarray_contains_point to ptarray file, so that all other liblwgeom functions can use the one routine. R Regular Expression. split() and re. There have also been reports on Windows machines of the wrong version being installed. Want to learn more about Python?. There are no such functions in Perl (though I. Escape characters (also called escape sequences or escape codes) are used to signal an alternative interpretation of a series of characters. As part of a series on Python text operations, this NCLab video demonstrates how to use the special character \n to start a new line. {2} quantifies this 2 times. His key id ED9D77D5 is a v3 key and was used to sign older releases; because it is an old MD5 key and rejected by more recent implementations, ED9D77D5 is no longer included in the public. This video is a tutorial of how to remove a specific character from a string in Python Python script to. In this part, we take a step back and look at some of the other functions Python offers in the re module, then we talk about some common mistakes people regularly (ha!) make. NET regex reference. See also Any White-Space Except Newline. "I went \n to the store\n" becomes "I went to the store" I'm thinking perhaps regex would be the best way. But Python's re module only supports \uFFFF starting with Python 3. Python's documentation, tutorials, and guides are constantly evolving. 2012-09-28 22:51 pramsey * Remove unused point in poly function 2012-09-28 22:48 pramsey * Add ptarray_contains_point to ptarray file, so that all other liblwgeom functions can use the one routine. 2 and earlier, \uFFFF works when you add your regex as a literal (Unicode) string to your Python code. R has various functions for regular expression based match and replaces. SQL Viewer, Formatter, Editor. The solution is to use Python’s raw string notation for regular expressions; backslashes are not handled in any special way in a string literal prefixed with 'r', so r"\n" is a two-character string containing '\' and 'n', while "\n" is a one-character string containing a newline. The String object is Immutable , it cannot be modified once it created, that means every time you use any operation in the String object , you create a new String Object. If the search is successful, search() returns a match object or None otherwise. Re: python: remove whitespace around variables when using print Originally Posted by myrtle1908 I don't know much about python but why do you have a comma after n?. The find() method returns the lowest index of the substring if it is found in given string. You can still take a look, but it might be a bit quirky. Turning Modes On and Off for Only Part of The Regular Expression. There are no such functions in Perl (though I. A regular expression (or RE) specifies a set of strings that matches it; the functions in this module let you check if a particular string matches a given regular expression (or if a given regular expression matches a particular string, which comes down to the same thing). adds to that set of characters. The constructor of the regular expression object, for example, new RegExp('ab+c'), provides runtime compilation of the regular expression. Regular expression (pattern): The pattern which is searched for in the target sequence. Regular expression? How to break lines in Notepad++. I have a large (2 Million rows) csv file exported from a SQL Server database. You can use the same method to expand the match of any regular expression to an entire line, or a block of complete lines. text = I'm a really good aaaaaa eeeeer jjjjj llll bb I couldn't figure out what regex I could use so I can remove these words completely. For a more concise introduction please see the Python documentation re -- Regular expression operations. That said, when you actually go to add to the file, you. Allows the regex to match the number if it appears at the beginning of a line, with no characters before it. Regular Expression Syntax¶. Regular Expressions will save your life! I am closing out 2017 with a refreshing project that has led me away from Power BI for a bit. This is obviously a job for regex (I think), and parsing through the file and removing all instances of the newline character sounds like it would work, but it doesn't seem to be going over all that well for me. Replace can act upon spaces. The conversion should be done in-place and solution should handle trailing and leading spaces and also remove preceding spaces before common punctuation like full stop, comma and. python php c# java cpp c javascript vb# html bootstrap css sql jquery mysql angularjs html5 dom winapi android-java win32 css3 software web-hosting bootstrap4 binary wordpress phpmyadmin firefox wpf clisp laravel netbeans prototype ide opengl xampp windows download fontawesome5 xdebug iphone hardware apache dot-net-library webgl xhtml browser. Python has built-in support for regular function. So, Python throws away red's old value (5), and replaces it with 10. For example, below is a Python 3 program that opens lorem. A Re gular Ex pression (RegEx) is a sequence of characters that defines a search pattern. 10) by Marcin Szamotulski mszamot [AT] gmail [DOT] com ----- If you found this plugin useful or you have any kind of problems with running it or some ideas to share, you are cordially invited to write to me: [email protected] It allows you to be lazy. Now we get to appending a file in python. We use a pattern to change multiple spaces to single spaces. A Python program can read a text file using the built-in open() function. But Python's re module only supports \uFFFF starting with Python 3. In this tutorial, you will learn about regular expressions (RegEx), and use Python's re module to work with RegEx (with the help of examples). Useful one liners and sed notes. Python Central is a one-stop resource for Python programmers. In this article we have explained important string manipulation with set of examples. HTML is used extensively on the Internet. Remove consecutive spaces with split and join. Put in a dot, and everything matches just fine when you test the regex on valid data. I'm using Unicode Regular Expressions with the following categories \p{L} : any kind of letter from any language. and the results I wanted a lot of new lines replaced with one or two new lines such as comments in the facebook. Once all illegal characters have been removed the function returns the cleaned string. The string class has a method replace that can be used to replace substrings in a string. x Docs Python 2. I have the following functions which help me to open a text file and remove any blank (empty) lines: Another thing is that python functions/variables should named. We will check each character of the string using for loop. Python Forums on Bytes. Binary Number [^\D2-9]+ This is the same idea as the regex above to match alphanumeric characters. Well, beside the fact that you should consider upgrading to get this functionality in a single click, in previous versions of UltraEdit where Perl regular expressions are supported, you can use the following Perl regex to delete all blank lines in your text file. Python RegEx: Regular Expressions can be used to search, edit and manipulate text. Lesson 4: Excluding specific characters In some cases, we might know that there are specific characters that we don't want to match too, for example, we might only want to match phone numbers that are not from the area code 650. String objects are immutable that is they cannot be changed after they have been created. , DOS-style \r\n newlines and MAC-style \r newlines) into its chosen newline marker for internal operations, which is the Unix newline, \n. Line Break Characters The tutorial page about the dot already discussed which characters are seen as line break characters by the various regex flavors. Understanding Python Regex (concatenation, alternation, and repetition) and how to use the Python re module to match strings and byte sequences to a regular expression. In Python 3. A regular expression is a pattern that describes a set of strings. This Python 3 tutorial covers how to read CSV data in from a file and then use it in Python. "I went \n to the store\n" becomes "I went to the store" I'm thinking perhaps regex would be the best way. A Rust library for parsing, compiling, and executing regular expressions. Please try again later. Regex maybe the most popular language in the programming world. Replace can act upon spaces. In some cases, such as when using alternation, you will need to group the original regex together using parentheses. Is there a way to remove new line characters in one go from all columns? Thanks. Python Exercises, Practice and Solution: Write a Python program to remove newline characters from a file. Regular Expression, or regex or regexp in short, is extremely and amazingly powerful in searching and manipulating text strings, particularly in processing text files. x, the special re sequence '\s' matches Unicode whitespace characters including [ \t\n\r\f\v]. Regular expression tester with syntax highlighting, PHP / PCRE & JS Support, contextual help, cheat sheet, reference, and searchable community patterns. We will check each character of the string using for loop. In most regex flavors, a lookbehind must have a fixed number of characters, or at least a number of characters within a specified range. Replace, Merge Multiple Spaces This C# example program shows how to remove multiple spaces in strings with Regex. Thus, I need a way to split some text on newlines, but keep the newlines. Example file. For example: >>> "Hello people". Beautiful Soup is packaged as Python 2 code. Is there an easy way to go about. My target is to keep the information short, relevant and focus on the most important topics which are absolutely. If you don’t install the package, the code won’t be converted. The following are code examples for showing how to use re. *automatic-tex-plugin. The following are code examples for showing how to use re. This is a page that is devoted to short programs that can perform powerful operations. After all, 'HaHaHa' and 'HaHaHaHa' are also valid matches of the regular expression (Ha){3,5}. There are no such functions in Perl (though I. Put in a dot, and everything matches just fine when you test the regex on valid data. : m: For patterns that include anchors (i. Python Modules Overview. List Remove Duplicates Exercise 14 (and Solution ) Write a program (function!) that takes a list and returns a new list that contains all the elements of the first list minus all the duplicates. Online regex tester and debugger: PHP, PCRE, Python, Golang and JavaScript Regular Reg Expressions Ex 101. Line Break Characters The tutorial page about the dot already discussed which characters are seen as line break characters by the various regex flavors. How do I remove the front whitespace from all the lines? @rdrey: Actually, ^ in multiline mode matches after each newline, so that won't be a problem (except for "\n\n"). Python Program to Remove Punctuations From a String This program removes all punctuations from a string. Regular expressions are a powerful and standardized way of searching, replacing, and parsing text with complex patterns of characters. python php c# java cpp c javascript vb# html bootstrap css sql jquery mysql angularjs html5 dom winapi android-java win32 css3 software web-hosting bootstrap4 binary wordpress phpmyadmin firefox wpf clisp laravel netbeans prototype ide opengl xampp windows download fontawesome5 xdebug iphone hardware apache dot-net-library webgl xhtml browser. Note Although the formal definition of "regular expression" is limited to expressions that describe regular languages, some of the extensions supported by re go beyond describing regular languages. This is my regex: [\n+\s+]$ Actually, even simplifying it to [\n] or [\r\n] is not matching any newlines! What might be the cause of this? Note that I am not entering the regex in Python code, I am entering it in a regex-supporting Find/Replace. Just to be thorough, I am going to assume that you want to take user input, split the sentences out of the input (say a paragraph of text), and then print the output with an empty line between each sentence: [code]input -> parse -> output [/code]F.