Regex Tester
Test JavaScript regular expressions with live match highlighting and plain-English explanations.
Click a tag to insert it at the cursor position
Test string
Highlighted matches
3good@example.com not-an-email learner@coddy.tech bad@domain user.name+tag@sub.domain.io
Explanation
^Start of string (or line with m flag)[\w.+-]+Character class — one of \w.+-, one or more times@Literal “@”[\w-]+Character class — one of \w-, one or more times\.Escaped literal “.”[\w.-]+Character class — one of \w.-, one or more times$End of string (or line with m flag)Reference
EngineJavaScript RegExp only — matches browser and Node behavior
Flagsg find all · i ignore case · m ^/$ per line · s . matches newline · u Unicode · y sticky
SlashesDo not wrap the pattern in /…/ — those are JS literal syntax, not part of the pattern
PrivacyEverything runs locally in your browser — nothing is uploaded