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Best Regular Expression Testers in 2026

When you are writing or troubleshooting a regular expression, a tester can help reveal how a pattern behaves against text. Compare the regex flavors supported and whether pattern explanations or a step-through debugger are available. Code generation and saved patterns may be useful for carrying work forward, while available platforms, free plans, and paid-from pricing help you assess practical fit. RegexCraft, RegexPilot, and Debuggex are among the tools shown. Think about the languages and workflow you use, and compare the listed features that would help you inspect, refine, or reuse patterns.

  1. 1

    AppTools Regex Tester

    Free plan AndroidiPhoneLinux+3

    The tester offers pattern explanations, debugging, and several regex flavors without requiring sign-up or installation.

    7.7 Free plan Visit site
  2. 2

    regex101

    Free plan APILinuxSelf-hosted+1

    regex101 combines multi-flavor pattern testing with explanations, debugging and export options.

    7.6 Free plan · 7-day trial Visit site
  3. 3

    Debuggex

    Free plan Self-hostedWeb

    Debuggex combines visual inspection, testing, and sharing for three regex flavors.

    7.4 Free plan Visit site
  4. 4

    RegexCraft

    Free plan LinuxMacWindows

    RegexCraft brings expression testing, comparison, debugging and folder-level search into one desktop workbench.

    7.4 Free plan · paid from $49 Visit site
  5. 5

    RegexPilot

    Free plan ExtensionMacWeb

    RegexPilot combines visual pattern construction, language-specific testing, AI options, and export tools in a Mac app.

    7.3 Free plan · paid from €19 · 30-day trial Visit site
  6. 6

    Regex Hero

    Free plan WebWindows

    Regex Hero focuses on .NET pattern testing, with editing assistance, code generation, and a browsable regex library. Mac users should note that the home page says a Mac version is not available.

    7.2 Free plan Visit site
  7. 7

    RegexPlanet

    Free plan Web

    Choose RegexPlanet if you need a free web-based place to compare regex behavior across its supported engines, especially with the Java tester’s input and matching controls.

    6.9 Free plan Visit site
  8. 8

    RegExr

    Free plan Web

    RegExr combines a browser-based editor with explanations, tests, and learning resources. Be aware that shared Community copies cannot later be changed or removed.

    6.9 Free plan Visit site
  9. 9

    RegexAssistant

    Free plan Windows

    RegexAssistant offers live expression checking, a token reference, replacement, and wildcard conversion in a free Windows tool. Building from the repository requires additional software dependencies.

    6.8 Open source Visit site
  10. 10

    RegexRegex

    Free plan Web

    RegexRegex offers local JavaScript testing alongside guided pattern building, saved test cases, and replacement previews.

    6.8 Free plan Visit site
  11. 11

    Regex Shuttle

    Free plan Web

    Regex Shuttle combines a tester, explainer, pattern library, substitution preview, and cheat sheet in a free browser tool.

    6.8 Free plan Visit site
  12. 12

    Regex Tester Pro

    Free plan Extension

    Choose Regex Tester Pro for browser-based pattern debugging, replacement previews, and code generation, with offline use and a free plan.

    6.7 Free plan Visit site
  13. 13

    RegEx Visualizer & Explainer

    Free plan Web

    This free browser tool brings pattern inspection, explanations, and debugging into one place for JavaScript RegExp. Check dialect compatibility before relying on a pattern in another language.

    6.6 Free plan Visit site
  14. 14

    Retest

    Free plan Linux

    Retest provides match highlighting and an optional indexed match list in a Linux terminal workflow. It is a focused option for developers comfortable working from the command line.

    6.6 Open source Visit site
  15. 15

    The Regex Coach

    Free plan LinuxWindows

    The Regex Coach offers interactive inspection and explanation for Perl-compatible patterns at no charge.

    6.6 Free plan Visit site
  16. 16

    SK Play Labs Regex Tester

    Free plan Web

    Choose SK Play Labs Regex Tester to learn common regex syntax or inspect matches and capture groups in JavaScript.

    6.5 Free plan Visit site
  17. 17

    txtnode Regex Tester

    Free plan Web

    Choose txtnode Regex Tester if you want a free browser utility for checking JavaScript regular expressions, capture groups, and replacement output.

    6.5 Free plan Visit site
  18. 18

    RegexStudio

    Free plan Web

    RegexStudio brings testing, debugging, diagrams, and learning resources into one browser-based workbench. Check its PCRE2 and debugger limits when working with large or complex expressions.

    6.4 Free plan Visit site
  19. 19

    RegEx Tester

    Free plan Web

    Choose RegEx Tester when you want a free browser tool to try patterns, inspect results, and work with captures or replacements.

    6.4 Free plan Visit site
  20. 20

    Regex Playground

    Free plan Web
    6.1 Free plan Visit site
  21. 21

    RegexBuddy

    Paid LinuxWindows

    RegexBuddy brings pattern building, testing, debugging, conversion and file search into one desktop product. Its Windows focus and lack of a free evaluation are worth weighing before purchase.

    5.7 Visit site
  22. 22

    Regexo

    Paid LinuxMacWindows

    Choose Regexo if you want a free desktop tool for checking Java regular expressions, replacing matches, and keeping saved patterns.

    5.4 Free plan Visit site
  23. 23

    Regulex

    Paid LinuxWeb

    Choose Regulex to visualize JavaScript regular expressions in a browser or use its documented APIs in Node.js. Its graph export and embed controls are useful when you need to share a visualization.

    4.8 Open source Visit site

#1Places #1, #2, #3, #4, #5 on this list can be bought by the makers of the software on it. See the price

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