Regular expression

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.

• GitHub: https://github.com/topics/regular-expression
• Wikipedia: https://en.wikipedia.org/wiki/Regular_expression
• Created by: Stephen Cole Kleene
• Released: 1950
• Related Topics: pattern-matching, wildcard, glob, grep, awk, sed,
• Aliases: regex, regexp, regular-expressions,
• Last updated: 2025-02-10 00:25:27 UTC
• JSON Representation

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Regular expression Awesome Lists

Computer-Science-Resources 51 awesome-regex 145

Regular expression Categories

Content 56 Regex engines 38 JavaScript regex evolution 22 Testers 15 JavaScript regex libraries 15 Performance 13 Tutorials 11 Grep-like tools 6 Visualizers 6 Syntax-free regex builders 4 Miscelaneous 4 Articles 3 Books 3 Communities 2 Collections of patterns 2