content/snippets/js/s/regexp-cheatsheet.md
^: start of the string or the start of a line in a multiline pattern$: end of the string or the end of a line in a multiline pattern\b: word boundary\B: not word boundary (opposite of \b)[!NOTE]
Anchors are non-quantifiable (i.e. cannot be followed by a quantifier).
.: any character except line breaks\w: any word character\W: any non-word character (opposite of \w)\s: any whitespace character\S: any non-whitespace character (opposite of \s)\d: any digit character\D: any non-digit character (opposite of \d)[abc]: a single character in the given set (here a, b or c)[^abc]: a single character not in the given set (opposite of [abc])[a-z]: a single character in the given range (here between a and z inclusive)[^a-z]: a single character not in the given range (opposite of [a-z])[a-zA-Z]: a single character in either of the given ranges[!TIP]
Use
\to escape special characters (e.g.\,/,[,],(,),{,}etc.).
a?: zero or one of a (equal to a{0,1})a*: zero or more of a (equal to a{0,})a+: one or more of a (equal to a{1,})a{3}: exactly 3 of aa{3,}: 3 or more of aa{3,5}: between 3 and 5 of a (inclusive)[!NOTE]
ais any valid quantifiable expression.
(ab): match and capture everything enclosed (here exactly ab)(a|b): match and capture either one character (here a or b)(?:ab): match everything enclosed, without capturingg: Globalm: Multilinei: Case insensitiveu: UnicodeNote that this cheatsheet is meant only as a starting point and is by no means a complete guide to all the features and nuances of regular expressions.