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 command-line tool and Rust library with Python bindings for generating regular expressions from user-provided test cases
An implementation of regular expressions for Rust. This implementation uses finite automata and guarantees linear time matching on all inputs.
Learn Python Regular Expressions step by step from beginner to advanced levels
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General purpose plain text editor for macOS. Widely known for its live collaboration feature.
It makes a preview from an URL, grabbing all the information such as title, relevant texts and images.
🦉 human-readable regular expressions
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A Windows Shell Extension for more advanced bulk renaming using search and replace or regular expressions
A high-performance C++ regex library and lexical analyzer generator with Unicode support. Extends Flex++ with Unicode support, indent/dedent anchors, lazy quantifiers, functions for lex and syntax error reporting and more. Seamlessly integrates with Bison and other parsers.
node.js bindings for RE2: fast, safe alternative to backtracking regular expression engines.
Simple library for regular expressions in PHP.
Rust library for regular expressions using "fancy" features like look-around and backreferences
Generate JavaScript-compatible regular expressions based on a given set of Unicode symbols or code points.
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