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regex101

Online regular expression tester and debugger with explanations, for many languages (PCRE, JavaScript, Python…).

  • Limited free plan
  • the web

Overview

Features described on its official pages and on its official website: debugging.

Overview written by LicitPro from the documentation published by the authors and the cited sources; we have not tried the resource ourselves.

Excerpts that establish this information
  • “Online regular expression tester and debugger with explanations, for many languages (PCRE, JavaScript, Python…).” — official page, 10 November 2026

At a glance

regex101 offers a limited free plan; advanced features or heavier use are paid.

Its licence could not be established at the source: check the terms on the official website.

Plans and conditions

  • Paid subscriptions offered by the publisher.

Weaknesses

  • Limited free plan

Sources and checks

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