Tools

Regex Tester for Pattern Matching

Test regular expressions against sample text and view matches.

Regex Tester

Test a regular expression against sample text and see matches immediately. This helps developers validate patterns before putting them into code, configs, or search tools.

How to use the Regex Tester

  1. Enter your regex pattern and any flags.
  2. Paste the sample text to match against.
  3. Click Test to view matches.

Common use cases

  • Validating form input rules.
  • Building extractors for logs or text files.
  • Troubleshooting search or replace patterns.
  • Verifying regex patterns in documentation.

Tips & notes

  • Start with small samples before scaling to large inputs.
  • Use the g flag to find multiple matches.
  • Escape special characters if you want literal matches.

Related developer tools

  • Regex Performance Tester
  • JSON Formatter
  • SQL Minifier

FAQ

Which regex flavor is used?
JavaScript RegExp syntax is used for testing.
Can I use flags?
Yes. Use flags like i, m, s, or g.
Does it show capture groups?
It highlights matches; capture groups can be inferred from the pattern.