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Formatters & Code

Regex-tester

Gratis regex-tester met live markering. Schrijf JavaScript regex, zie matches en capture groups updates terwijl u typt. Dezelfde engine die uw browser gebruikt.

Runs in your browser
Pattern
//gi
Flags
Common patterns
Test string2 matches
Highlighted
Email ada@example.com or grace.hopper@navy.mil for info.
Matcheswith capture groups
  • #1 · index 6ada@example.com
    • $1ada
    • $2example.com
  • #2 · index 25grace.hopper@navy.mil
    • $1grace.hopper
    • $2navy.mil
Replace

Toggle on to write a replacement string and see the result. Use $1, $2, … to reference capture groups.

Cheatsheet
  • \dany digit (0-9)
  • \wword character (letters, digits, _)
  • \sany whitespace
  • .any single character
  • *zero or more of the preceding
  • +one or more
  • ?optional (0 or 1)
  • {n,m}between n and m of the preceding
  • ^start of string (or line with m)
  • $end of string (or line with m)
  • [abc]any of a, b, or c
  • [^a-z]anything BUT lowercase a-z
  • (…)capture group
  • (?:…)non-capturing group
  • |alternation (or)

Redactionele opmerking

Understanding · Patterns, not literals.

Dit uitgebreide hoofdstuk is momenteel alleen in het Engels beschikbaar. De conversietool hierboven werkt in jouw taal; de lange uitleg is nog niet vertaald.

Veelgestelde vragen

Quick answers.

›Which regex flavor is used?

JavaScript regex (ECMAScript), evaluated by the same engine your browser uses. Matches PCRE for most common patterns but differs on lookbehinds and named groups.

›What flags can I use?

g (global), i (case-insensitive), m (multiline), s (dotAll), u (unicode), y (sticky).

›Are matches highlighted live?

Yes — every keystroke re-runs the regex and updates highlights immediately.

›Are capture groups shown?

Yes. Numbered and named capture groups are listed for each match.

›Is my input sent anywhere?

No — everything runs in your browser. Useful when testing regex against sensitive text.

›Is the regex tester free?

Yes — fully free, no signup.

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