Regex Tester
Test JavaScript regular expressions and inspect match positions locally.
Inputs stay on your device; no account required.
JavaScript syntax; flags g, i, m, s, u. Up to 1,000 pattern characters, 50,000 text characters and 500 matches. Runs in an isolated worker with a 1.5-second time limit. No replacement operation.
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About this tool
Test JavaScript regular expressions and inspect match positions locally. JavaScript syntax; flags g, i, m, s, u. Up to 1,000 pattern characters, 50,000 text characters and 500 matches. Runs in an isolated worker with a 1.5-second time limit. No replacement operation.
How to use
- Enter the JavaScript regular expression, flags and sample text separately.
- Run the test and inspect each match, position and captured group.
Example
Pattern \d+ with flag g on item 12 and item 34 finds 12 and 34.
Common question
Which regular expression syntax is supported?
JavaScript syntax; flags g, i, m, s, u. Up to 1,000 pattern characters, 50,000 text characters and 500 matches. Runs in an isolated worker with a 1.5-second time limit. No replacement operation.