Visual regex tester

Live match highlighting, capture groups, and a built-in cheat sheet.

//
Test string0 matches

Presets

Cheat sheet

Digit\d
Non-digit\D
Word char\w
Whitespace\s
Any char.
Zero or more*
One or more+
Optional?
Start of line^
End of line$
Capture group(abc)

What this tool does

Live JS regex highlight plus capture groups and a quick syntax cheat sheet. Same engine as front-end code.

How to use

  1. Enter pattern and flags (default g).
  2. Paste test text and watch highlights.
  3. Inspect groups, then copy the pattern.

FAQ

Same as Python/Java?

Mostly — lookbehinds/named groups differ. Results follow JavaScript.

Invalid pattern?

You get a syntax error — the page won’t freeze.

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