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Local file processing

Regex Tester

Test a JavaScript regular expression on text and inspect every match, group and position.

Processed on this device
Paste text or open a fileOr start from an example:
Waiting for input

JavaScript regex runs locally. Slow expressions are stopped after one second.

Matches

The result appears here.

Ctrl+↵ copy result · Ctrl+Shift+F result to input

How it works

How to use Regex Tester

  1. Paste sample text.
  2. Enter a regular expression and choose its flags.
  3. Review matches and groups, then copy the match list.
Frequently asked questions

Useful details

2 answers
Which regex syntax is supported?

Your browser's JavaScript regular expressions.

What happens with a slow pattern?

Testing runs in a separate browser worker and stops after one second. Shorten the text or simplify the pattern if that happens.

More help

Guides, common conversions and useful next steps.

Continue with your result

Use the action beside a finished result to send it directly, or open another tool: