PHP RegExp

[abc]A single character of: a, b or c
[^abc]Any single character except: a, b, or c
[a-z]Any single character in the range a-z
[a-zA-Z]Any single character in the range a-z or A-Z
^Start of line
$End of line
\AStart of string
\zEnd of string
.Any single character
\sAny whitespace character
\SAny non-whitespace character
\dAny digit
\DAny non-digit
\wAny word character (letter, number, underscore)
\WAny non-word character
\bAny word boundary
(...) Capture everything enclosed
(a|b) a or b
a? Zero or one of a
a* Zero or more of a
a+ One or more of a
a{3} Exactly 3 of a
a{3,} 3 or more of a
a{3,6} Between 3 and 6 of a
i case insensitive
m treat as multi-line string
s dot matches newline
x ignore whitespace in regex
A matches only at the start of string
D matches only at the end of string
U non-greedy matching by default

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