Regular Expression (Regex) Explainer & Tester

Break down complex regular expressions into plain-language components and test patterns against live sample text instantly.

Regular Expression Pattern:

/ /g

Common Regex Patterns (Click to Load):

Email Address URL Phone Number ISO Date (YYYY-MM-DD)

Pattern Breakdown:

Test String:

Contact support at support.team@devdocs.io or user.name+tag@sub.domain.org for assistance. Invalid emails like test@com or missing domain.

Match Results & Highlighting:

Regex Quick Reference Cheat Sheet

Anchors & Boundaries

^ : Start of string
$ : End of string
\b : Word boundary

Character Classes

\d : Any digit (0-9)
\w : Word char (a-z, A-Z, 0-9, _)
\s : Whitespace
. : Any character except newline

Quantifiers

* : 0 or more times
+ : 1 or more times
? : 0 or 1 time (optional)
{n,m} : Between n and m times

Frequently Asked Questions (FAQ)

Greedy quantifiers (like * and +) match as much text as possible before satisfying the rest of the pattern. Lazy quantifiers (like *? and +?) match as little text as possible.

Yes. All regex evaluations and testing take place entirely client-side in your browser environment without transmitting any text or patterns to external servers.