Regular Expression Tester

. any char \d digit \D non-digit \w word \W non-word \s whitespace \S non-space [abc] set [^abc] negated [a-z] range

^ start $ end \b word bound \B non-bound

* 0 or more + 1 or more ? optional {3} exact {2,5} range *? lazy +? lazy+

(abc) capture (?:abc) non-cap (?<n>abc) named a|b or

(?=abc) ahead + (?!abc) ahead - (?<=abc) behind + (?<!abc) behind -

\n newline \t tab \r CR \\ backslash