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Regular Expression Tester

Test JavaScript regular expressions, inspect matches and capture groups, and preview replacement output.

Regex tester

Uses JavaScript regular-expression syntax and flags.

Pattern

Flags

Test text

Replacement preview (optional)

Match	Index	Capture groups
ada@example.com	8	ada · example.com
grace@example.org	27	grace · example.org

Replacement result

Contact ada at example.com or grace at example.org for access.

Global expressions return every match with its character index and captured groups, making patterns easier to debug against representative input.

Try replacement references such as $1 without modifying a real file or sending text to a remote service.