Reference
Character Classes
.- any character except newline
\w- word
\d- digit
\s- whitespace
\W- not word
\D- not digit
\S- not whitespace
[abc]- any of a, b, or c
[^abc]- not a, b, or c
[a-g]- character between a and g
Anchors
^abc$- start / end of the string
\b- word boundary
\B- non-word boundary
Escaped Characters
\.- escaped period
\*- escaped asterisk
\\- escaped backslash
\t- tab
\n- linefeed
\r- carriage return
Groups & Lookaround
(abc)- capture group
\1- backreference to group #1
(?:abc)- non-capturing group
(?=abc)- positive lookahead
(?!abc)- negative lookahead
Quantifiers & Alternation
a*- 0 or more
a+- 1 or more
a?- 0 or 1
a{5}- exactly five
a{2,}- two or more
a{1,3}- between one and three
a+?- match as few as possible
a{2,}?- match as few as possible
ab|cd- match
ab or cd
Snippets
Remove Word Parts
^\w*/[aoi]$\n:.*\n
Remove Suffixes
^-\w*$\n:.*\n
Remove Prefixes
^\w*-$\n:.*\n
Find & Replace
- Find
- Capture groups are listed in parenthesis.
(.*)<\/h1>
- Replace
- Capture groups are referenced by $index.
$1