What regex flavour does this use?

JavaScript's built-in RegExp. This is compatible with Node.js, browser JavaScript, and many other environments.

What does the g flag do?

The global flag (g) finds all matches in the string, not just the first one.

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Regex Tester

Test and debug regular expressions with live match highlighting.

Quick patterns

Regular expression

Without /slashes/

Flags

g i m s

Test string

2 matches found

Regex Patterns Every Developer Should Know

Email validation, URL matching, phone number extraction, and postcode verification are common regex tasks. Quick-insert buttons provide tested patterns for these common cases.

Frequently Asked Questions

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