RegEx Builder

Build and test regular expressions with real-time validation

Pattern Builder

Select a common pattern or write your own

Common Patterns

RegEx Pattern

Flags

g (global), i (case-insensitive), m (multiline), etc.

Test Area

Test your regular expression against sample text

Test String

Pattern Match:

RegEx Guide

Basic Patterns

. - Any character except newline
\w - Word character [A-Za-z0-9_]
\d - Digit [0-9]
\s - Whitespace character
[abc] - Any character in the set
[^abc] - Any character not in the set

Quantifiers

* - 0 or more
+ - 1 or more
? - 0 or 1
{n} - Exactly n times
{n,} - n or more times
{n,m} - Between n and m times