Regex tools — test, replace and grep lines

Live 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.

Key terms

Live match highlight
Capture groups
Bulk replace
Grep log lines
JSON path finder

Tool guides

Regex Tester — live pattern match
Find Replace — bulk text replace

Related collections

Regex lab — test & replace
Regex & parser tools — test and transform

Frequently asked questions

Which regex flavor?

JavaScript (ECMAScript) in browser.

ReDoS safe?

Avoid catastrophic patterns on huge inputs.

Save patterns?

Copy to snippet manager or repo docs.

Browse all tools