A regular expression (shortened as regex or regexp), sometimes referred to as rational expression, is a sequence of characters that specifies a match pattern in text. Usually such patterns are used by string-searching algorithms for “find” or “find and replace” operations on strings, or for input validation.
Regular expression techniques are developed in theoretical computer science and formal language theory. They are used in search engines, in search and replace dialogs of word processors and text editors, in text processing utilities such as sed and AWK, and in lexical analysis. Regular expressions are also supported in many programming languages.
Different syntaxes for writing regular expressions have existed since the 1980s, one being the POSIX standard and another, widely used, being the Perl syntax.
📜 A Cheat-Sheet Collection from the WWW
⌨️ Wordlists, Dictionaries and Other Data Sets for Writing Software Security Test Cases
Cheatsheet for different regex syntaxes
Shell脚本笔记：[进度-80%]正则表达式、GREP、SED、AWK、函数
This is a source code repository of bregonig.dll regular expression library.
Regular expression for matching DOIs
Utility to convert between various subscription format
JavaScript workshop (forms, inputs, regex, ajax, localstorage etc)
Searchmonkey - Power searching without the pain. Perform powerful desktop searches using regular expressions. Graphical equivalent to find + grep.
Interactive Tutorial for Regular Expressions | Interaktives Tutorial für Reguläre Ausdrücke
A generic syntactic and lexical analyzer (context-free grammar)
Fast Server-side Search Engine for Javadoc API
💡 Learn how to use and get the most out of regular expressions.
JavaScript output of selected code with span color classes for a pre code block.
A regular expression tool with live-updating search and replace
Consume a text file with sentences and produce a tweet (< 145 characters) with the style of the input text. I see several layers of success in this project and encourage you to shoot for the level that best matches your team's abilities: Level 1 does the base Markov Sentence Generation from the sample text. (Google around and you'll find lots of…
Created by Stephen Cole Kleene
Released 1950