RegExr

An interactive workspace for learning, building, and testing JavaScript and PCRE regular expressions.

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Overview

RegExr pairs a pattern editor with test text, match details, reference material, and saved examples.

Why it is useful

Results update while you type, which makes small pattern changes easier to inspect than running a script repeatedly.

Good fit for

Developers, data workers, and learners who need to understand a pattern before using it.

Try it when

  • Testing a validation pattern against sample input
  • Inspecting capture groups and matches
  • Learning a regular-expression feature with examples

regex101

Test regular expressions in a selected engine, inspect explanations and capture groups, and preview text replacements.

  • regex
  • testing
  • reference

Web Utility

Regex Vis

View a regular expression's branches, groups, and repetition as a diagram, then check it against test strings.

  • regex
  • visualization
  • testing

Web Utility

Applitools

Applitools offers visual testing and interface comparison for teams comparing interface differences across browsers.

  • testing
  • browser-automation

Web Utility