Regex

Rust library.

.NET.

Includes regex debugger, DSL builder.

Java, JavaScript, MySQL, PHP, Python, Ruby.

Interactive tutorial and practice problems.

Guide to using regexes in JavaScript.

Visual, example-based ebook for beginners.

Graphical editor with visual hierarchy. Flavor: JavaScript.

Better and faster grep. Recursively searches directories while respecting gitignore rules and skipping hidden/binary files.

Rename files uses regexes.

Rename files using regexes.

Forked from Oniguruma. Used by Ruby 2.0+.

C regex library used by Ruby 1.9, TextMate grammars, etc.

Popular C regex library used by PHP, R, etc.

C++ regex library.

Intel's high-performance library, used for DPI.

Unicode org's package with full Unicode support.

JDK standard regexes.

Regex engine used by Safari.

Regex engine used by Chrome, Edge, Firefox, etc.

Shared by all .NET languages (C#, VB, etc.).

See perlreguts.

and regex

Standard and extended regex libraries.

Popular C++ regex library used by Go, etc. Non-backtracking engine.

Non-backtracking engine.

Regular Expression Feature Comparisons

Cross-engine benchmarking libraries

Cross-engine benchmarking libraries

JavaScript and Scala library for detecting ReDoS vulnerability. Can be used as an ESLint plugin.

Perl library for detecting ReDoS vulnerability.

A template tag for extended, readable, high-performance JavaScript regexes.

Convert Oniguruma patterns to native JavaScript regexes.

RE2

Rust's regex

Oniguruma.

A template tag that uses structured syntax with variables and comments.

A language that compiles to regexes.

Compose with functions:

Compose with functions:

Compose with functions:

Compose with functions:

AST builders:

AST builders:

AST builders:

AST builders:

AST builders:

Analyze AST nodes produced by regexpp.

ESLint plugin for finding regex mistakes, etc.

Add an execution timeout to regexes.

Partial regex matching:

Partial regex matching:

Check regex equivalence, build regex intersections, and other utilities.

Generate strings that match a given regex:

Generate strings that match a given regex:

Generate a regex that matches a set of strings.

Highlight regex syntax.

Generate Mermaid diagrams to visualize regexes.

(dotAll)

(which returns an iterator)

(hasIndices)

(unicodeSets)

like (?ims:…)

in separate alternation paths

although the only difference from ES3's replace when given a regex is that it throws if not using flag g

(Unicode property sets)

(2021) - Flag x (extended) with insignificant whitespace and line comments (#…), plus inline comments via (?#…)

(2021) - Atomic groups via (?>…) and possessive quantifiers (ex: *+, ++)

(2021) - Anchors \A and \z, not affected by flag m

(2021) - Outside character classes, \R matches any line terminator

(2020) - Scaled back RegExp subclassing

(2015) - Standardization of legacy features