Regex Pal 0.1.4 — a JavaScript regular expression tester RegexBuddy Android Regex Book Version History Blog Global (g) Case insensitive (i) ^$ match at line breaks (m) Dot matches all (s ; via XRegExp ) Quick Reference Options Highlight regex syntax Highlight matches Invert results . Any character except newline. \. A period (and so on for \* , \( , \\ , etc.) ^ The start of the string. $ The end of the string. \d , \w , \s A digit, word character [A-Za-z0-9_] , or whitespace. \D , \W , \S Anything except a digit, word character, or whitespace. [abc] Character a, b, or c. [a-z] a through z. [^abc] Any character except a, b, or c. aa|bb Either aa or bb. ? Zero or one of the preceding element. * Zero or more of the preceding element. + One or more of the preceding element. { n } Exactly n of the preceding elemen...