Ruby regex

[abc]
A single character: a, b or c
[^abc]
Any single character but 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
\A
Start of string
\z
End of string
.
Any single character
\s
Any whitespace character
\S
Any non-whitespace character
\d
Any digit
\D
Any non-digit
\w
Any word character (letter, number, underscore)
\W
Any non-word character
\b
Any word boundary character
\B
Any non-word boundary character
(...)
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 or 6 of a

Options:

/i
Case insensitive
/m
Multiline mode
/o
Perform #{...} substitutions only once
/x
Extended mode


Maintained by Pioz