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DEVELOPER BENCH
Enter a JavaScript regular expression pattern, flags, and sample text to see individual matches, capture groups, and zero-based match positions locally.
WHAT THIS DOES
Runs entirely in your browser.
/tools/regex-testerregex-testerv2.0.0LOCAL · LOCAL RUNIMPLEMENTED — This workbench is functional in the current release.Presets for this workbench
No preset yet. A preset stores the values in this form — never the result — and only for workbenches that run entirely in your browser.
Collections
Saved on this device only. Turn on sync to carry them to another device.
BATCH / ONE VALUE PER LINE
Up to 200 lines, one at a time, in this browser. Each line takes the place of text and everything else stays as you set it. Nothing is uploaded, and the row limit is not exceeded silently.
METHOD / LOCAL RUN
A JavaScript RegExp runs against the supplied text with global matching enabled for result collection. Each result reports its match, capture groups, and zero-based start/end positions.
Boundary: The workbench limits pattern and text length to keep common local tests responsive. JavaScript regular-expression syntax rules apply.
The calculation or transformation runs in your browser using the values entered above. No input is sent to UtilityForge for this tool.
EXAMPLES / LOCAL RUN FIXTURES
FAQ
No. This published tool runs locally in your browser. UtilityForge does not send the values entered in this workbench to a server.
The workbench states the exact method behind every result — the formula or procedure this page runs — so you can verify the computation instead of trusting a black box.
No. This workbench runs in the page: Pattern, Flags, Test text are read by the code your browser already downloaded, and UtilityForge receives neither the values nor the result.
Yes, and it is enforced rather than advertised: Pattern (500 characters), Flags (20 characters) and Test text (20,000 characters). The limit is a browser input limit on a tool that runs on this device, so nothing is truncated after being sent anywhere.
The workbench limits pattern and text length to keep common local tests responsive. JavaScript regular-expression syntax rules apply.
RELATED TOOLS
LOCAL — Runs entirely in your browser.
COMMON USE CASES / SOURCE NOTE
Last reviewed:
Source information: Browser JavaScript `RegExp` implementation; no external regex engine is used.