Regex Analysis Lab

Inspired by regex101, offering offline-ready testing, substitution, and quick-reference utilities.

Pattern & Flags

Waiting for input

Match Results

Overview

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Matches array
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Group details
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Highlight preview
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Replacement Tester

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Quick Reference

Curated shortcuts inspired by regex101 reference:

  • \\d — digit
  • \\w — word char
  • \\s — whitespace
  • . — any char (affected by dotAll)
  • ^ / $ — line start / end (multiline)
  • (?:...) — non-capturing group
  • ?= / ?! — positive / negative lookahead
  • {m,n} — quantifier range

For deeper dives, consult regex101 docs—this offline lab runs fully in-browser.