Regex Tester

.Any character except line breaks (or any character with the s flag)\dDigit (0-9)\DNon-digit\wWord character (letters, digits, underscore)\WNon-word character\sWhitespace (space, tab, newline)\SNon-whitespace[abc]Any of a, b, or c[^abc]None of a, b, or c[a-z]Range a through z

^Start of string (or line with m flag)$End of string (or line with m flag)\bWord boundary\BNon-word boundary

*0 or more+1 or more?0 or 1{n}Exactly n times{n,}n or more{n,m}Between n and m*? +? ??Lazy variants — match as few as possible

(...)Capturing group(?:...)Non-capturing group(?<name>...)Named capturing group\1, \2Backreference to numbered group\k<name>Backreference to named groupa|bAlternation — match a or b

(?=...)Positive lookahead(?!...)Negative lookahead(?<=...)Positive lookbehind(?<!...)Negative lookbehind

$&The full match$1, $2Numbered capture group$<name>Named capture group$$A literal $ sign$`Text before the match$'Text after the match