Regex tester

Test a regular expression with live match highlighting and groups.

Pattern

Flags: gu

Test text

Cheat sheet

.: Any character except a newline
\d \w \s: Digit, word character, whitespace
\D \W \S: Not a digit, word character, whitespace
[abc] [^abc]: Any of, or none of, the characters
[a-z]: A character in the range
^ $: Start and end of the text, or line with m
\b: Word boundary
* + ?: Zero or more, one or more, optional
{2} {2,} {2,5}: Exactly, at least, between
*? +?: As few as possible
(abc): Capture group
(?<name>abc): Named capture group
(?:abc): Group without capturing
a|b: Either a or b
(?=a) (?!a): Followed by, not followed by
(?<=a) (?<!a): Preceded by, not preceded by
\1 \k<name>: Same text as a group
\p{L}: A Unicode letter, needs u