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Skip to contentTest regular expressions with live highlighting, capture groups and replace preview — in your browser.
Full tool — runs in your browser. No sign-up required.
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Debug regex without switching to an IDE tab. Paste pattern and sample text, see matches highlighted instantly, inspect capture groups and try replace — all local in Tentaco. No need to push test strings to an online regex API.
Supports common flags (global, case-insensitive, multiline). Useful for log parsing, form validation snippets, grep-style extractions and teaching regex to teammates.
Compared with regex101.com: both are strong; Tentaco keeps simple tests inside the same toolbox as JSON, JWT and diff tools — one bookmark for daily dev utilities.
Patterns and sample text stay in your session — close the tab on shared machines after testing production data.
Open Regex Tester.
Enter pattern and flags.
Paste sample text — review highlighted matches.
Optional: test replace and copy result.
Transfer to Tentaco: No for the standard mode. Processing: local in the browser. Permanent storage: only if you copy or save the result yourself.
LocalThis tool processes data locally in your browser. Tentaco does not receive your file contents for this mode.
Matching runs locally in the browser.
JavaScript-style regex as used in browsers and Node.
Very large inputs may slow the tab — test a representative slice first.
Do not paste production PII on shared PCs; processing is local but screen/history may leak.
Yes.
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