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Skip to contentLive regex tester, bulk replace and log grep — local pattern lab.
Regex101 is great but pasting production logs to cloud sites risks leaks. Tentaco regex hub runs pattern debug, replace preview and line grep entirely in-browser.
JavaScript flavor — note differences when porting to Python or PCRE. Browse related Tentaco tools on this hub, open a studio mode when you need a fuller workspace, and keep files on your device whenever the tool runs locally.
Regex tester online — live match & replace free
Test regular expressions with live highlighting, capture groups and replace preview — in your browser.
Find Replace — bulk text replace
Find and replace text, with regex and case options. Tentaco Find & Replace: review input and get an instant result — free, no sign-up.
LocalThis tool processes data locally in your browser. Tentaco does not receive your file contents for this mode.
JavaScript (ECMAScript) in browser.
Avoid catastrophic patterns on huge inputs.
Copy to snippet manager or repo docs.