regex101
regex101.com
Build, test and debug regular expressions with live explanation
Visit website →Install: Web app (installable)Facts checked
On this page: About · In their words · Where it fits · Information · Facts · Related tools (6) · FAQ
About regex101
regex101 highlights matches as you type, explains every token of your pattern, supports PCRE, JavaScript, Python and more flavors, and includes a debugger and community pattern library — free.
Published 2026-08-06 · Links checked 2026-09-17
regex101 in their own words
“Build, test and debug regex online with real-time matches and clear explanations. Supports PCRE2, JavaScript, Python and more. Save and share your examples.”
Where regex101 fits
regex101 is tagged #regex, #debugging, #developer-tools. Each tag links to every listed tool that shares it.
- #regex — the only listing with this tag so far
- #debugging — 5 listed tools share this tag
- #developer-tools — 9 listed tools share this tag
regex101 is one of 72 Other tools listed on ToolDock. Also in Other: CreateEasily, Big Buck Bunny, Internet Archive — see the Other ranking (neutral, stable positions; no paid placement).
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Frequently asked questions
What is regex101?
regex101 is a Other tool: Build, test and debug regular expressions with live explanation. It is listed on ToolDock with a direct link to its official site.
Is regex101 free?
Yes — regex101 is listed as free on ToolDock. Pricing label set at listing time; official pricing page linked where verified — see the official website for current details.