09. Regex Tester
regex101-style playground: live match, highlight, groups, substitution, and quick reference.
Test string
Match highlight
Contact support@example.com or hello@breejeshrathod.com for help.
Also invalid: not-an-email and a@b.
Also invalid: not-an-email and a@b.
Match information
Explanation
(?<user>Named capturing group "user"\wMatches any word character [A-Za-z0-9_]+Quantifier: 1 or more of previous)Group end@Literal character "@"(?<domain>Named capturing group "domain"[\w.-]Character class — match one listed character+Quantifier: 1 or more of previous\.Literal .\wMatches any word character [A-Za-z0-9_]+Quantifier: 1 or more of previous)Group end
About this tool
Build, test, and debug JavaScript regular expressions in the browser — pattern/flags bar, live match highlighting, match information with capture groups, substitution, token explanation, and a quick reference (inspired by regex101.com). Fully client-side.
Dedicated URL for Regex Tester on utils.breejeshrathod.com — processing stays in your browser.