dlclark/regexp2

Health v2 · maintenance only

Flags: no_releases

Adoption not part of the score

1183 stars · 95 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

A full-featured regular expression engine for Go, ported from the .NET regex engine. It supports backtracking and Perl5/.NET-compatible patterns, trading the built-in regexp package's constant-time guarantees for expressive power.

Use cases

• use complex regex patterns with backtracking in Go
• match .NET-compatible regular expressions in Go
• use Perl5 regex features not supported by Go's regexp package
• split strings with regex matches in Go
• migrate .NET regex patterns to a Go application

When to choose

• you need backtracking, lookarounds, or other advanced regex features RE2 lacks
• you need pattern compatibility with .NET or Perl5
• you're porting code that relies on .NET regex semantics

When to avoid

• you need constant-time matching guarantees against catastrophic backtracking (use Go's built-in regexp/RE2)
• your patterns are simple and well-served by the standard library
• you're processing untrusted input where regex DoS is a concern

Facets

library · maturity active

parser developer-tools parsers go cross-platform regex-engine backtracking dotnet-compatible perl5-regex text-processing

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