Regex Tester

Test and debug regular expressions with real-time matching and highlighting. Validate patterns, test multiple strings, and understand regex behavior instantly.

Regex Tester Tool

Regular Expression Pattern

Regex Flags

g (Global) i (Case Insensitive) m (Multiline) s (Dot All) u (Unicode) y (Sticky)

Test Strings (One per line)

Regex Test Results

Pattern Analysis

Quick Regex Patterns

About Regular Expressions

Common Metacharacters

^ - Start of string/line

$ - End of string/line

. - Any character (except newline)

* - Zero or more repetitions

+ - One or more repetitions

? - Zero or one repetition

Character Classes

[abc] - Any character from set

[^abc] - Any character not in set

\d - Any digit [0-9]

\w - Word character [a-zA-Z0-9_]

\s - Whitespace character

\b - Word boundary

Regex Flags Explained

g (Global)

Find all matches, not just the first one

i (Case Insensitive)

Ignore case when matching

m (Multiline)

Treat string as multiple lines

s (Dot All)

Allow . to match newline characters

u (Unicode)

Enable full Unicode support

y (Sticky)

Match only from the lastIndex position