Regex cheatsheet as JS comments

regex_cheatsheet.js

//  From: http://regexone.com/
//
//  abc…     Letters
//  123…     Digits
//  \d       any Digit
//  .        any Character
//  \.       Period
//  [abc]    Only a, b, or c
//  [^abc]   Not a, b, nor c
//  [a-z]    Characters a to z
//  [0-9]    Numbers 0 to 9
//  {m}      m Repetitions
//  {m,n}    m to n Repetitions
//  *        Zero or more repetitions
//  +        One or more repetitions
//  ?        Optional
//  \s       any Whitespace
//  ^…$      Starts and ends
//  ()       capture Group
//  (a(bc))  capture Sub group
//  (.*)     capture Variable content
//  (a|b)    Matchs a or b
//  \w       any Alphanumeric character
//  \W       any Non-alphanumeric character
//  \d       any Digit
//  \D       any Non-digit character
//  \s       any Whitespace
//  \S       any Non-whitespace character