JavaScript Regex Cheatsheet

Regular Expression Basics . Any character except newline a The character a ab The string ab a|b a or b a* 0 or more a's \ Escapes a special character Regular Expression Quantifiers * 0 or more + 1 or more ? 0 or 1 {2} Exactly 2 {2, 5} Between 2 and 5 {2,} 2 or more Default is greedy. Append ? for reluctant. Regular Expression Groups (...) Capturing group (?:...) Non-capturing group \Y Match the Y'th captured group

Regular Expression Character Classes [ab-d] One character of: a, b, c, d [^ab-d] One character except: a, b, c, d [\b] Backspace character \d One digit \D One non-digit \s One whitespace \S One non-whitespace \w One word character \W One non-word character Regular Expression Assertions ^ Start of string $ End of string \b Word boundary \B Non-word boundary (?=...) Positive lookahead (?!...) Negative lookahead

Regular Expression Flags g Global Match i Ignore case m ^ and $ match start and end of line Regular Expression Special Characters \n Newline \r Carriage return \t Tab \0 Null character \YYY Octal character YYY \xYY Hexadecimal character YY \uYYYY Hexadecimal character YYYY \cY Control character Y Regular Expression Replacement $$ Inserts $ $& Insert entire match $` Insert preceding string $' Insert following string $Y Insert Y'th captured group