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Regex Tester

Test JavaScript regular expressions against your input string. Supports flags: g, i, m, s, u, y.

//g

Test string

Test Regular Expressions Against Real Text

Build and debug regular expressions with immediate feedback. Highlighted matches make it easier to refine patterns for validation, parsing, or simple text transforms.

Where It Helps

  • Validation: Emails, IDs, and custom formats (with care for edge cases).
  • Extraction: Capture groups for pulling fields from logs or text.
  • Refactoring: Find/replace patterns across snippets.

Tips

  • Prefer explicit patterns over overly broad wildcards.
  • Test with multiple samples, including edge cases and empty inputs.

Frequently asked questions

Which flavor of regex?

Standard JavaScript/PCRE‑like features for common web use cases.

Can I save patterns?

Copy patterns as plain text; the tool keeps everything local to your session.