Developer tool

Regex Tester

Test JavaScript regular expressions live. Matches are highlighted, capture groups (including named ones) are listed, and you can preview replacements.

Regular expression (without slashes)

Flags

g · global i · ignore case m · multiline s · dot matches newline u · unicode y · sticky

Test string

Contact ada@example.com or grace.hopper+navy@mail.example.org.
Invalid: bob@, @example.com

Matches highlighted

Replacement (supports $1, $<name>, $&)

Replacement result