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Regex: List of Tokes

Description
Extended description
Example
A single character of: a, b or c
Matches either an a, b or c character
[abc]
A character except for: a, b or c
Matches any character except for an a, b or c
[^abc]
A character in the range: a-z
Matches any characters between a and z, including a and z.
[a-z]
A character not in the range: a-z
Matches any characters except those in the range a-z.
[^a-z]
A character in the range: a-z or A-Z
Matches any characters between a-z or A-Z. You can combine as much as you, please.
[a-zA-Z]
Any single character
Matches any character other than newline (or including line terminators with the /s flag)
.
Alternate - match either a or b
Matches either what is before the | or what is after it - in this case `a` or `b`.
a|b
Any whitespace character
Matches any space, tab or newline character.
\s
Any non-whitespace character
Matches anything other than a space, tab or newline.
\S
Any digit
Matches any decimal digit. Equivalent to [0-9].
\d
Any non-digit
Matches anything other than a decimal/digit.
\D
Any word character
Matches any letter, digit or underscore. Equivalent to [a-zA-Z0-9_].
\w
Any non-word character
Matches anything other than a letter, digit or underscore. Equivalent to [^a-zA-Z0-9_]
\W
Match everything enclosed
A non-capturing group allows you to apply quantifiers to part of your regex but does not capture/assign an ID.
(?:...)
Capture everything enclosed
Isolates part of the full match to be later referred to by ID within the regex or the matches array. IDs start at 1.
(...)
Zero or one of a
Matches an `a` character or nothing.
a?
Zero or more of a
Matches zero or more consecutive `a` characters.
a*
One or more of a
Matches one or more consecutive `a` characters.
a+
Exactly 3 of a
Matches exactly 3 consecutive `a` characters.
a{3}
3 or more of a
Matches at least 3 consecutive `a` characters.
a{3,}
Between 3 and 6 of a
Matches between 3 and 6 (inclusive) consecutive `a` characters.
a{3,6}
Start of string
Matches the start of a string without consuming any characters. If /m multiline mode is used, this will also match immediately after a newline character.
^
End of string
Matches the end of a string without consuming any characters. If multiline mode is used, this will also match immediately before a newline character.
$
A word boundary
Matches, without consuming any characters, immediately between a character matched by \w and a character not matched by \w (in either order). It cannot be used to separate non words from words.
\b
Non-word boundary
Matches, without consuming any characters, at the position between two characters matched by \w.
\B
Newline
Matches a newline character
\n
Carriage return
Matches a carriage return, unicode character U+2185.
\r
Tab
Matches a tab character. Historically, tab stops happen every 8 characters.
\t
Null character
Matches a null character, most often visually represented in Unicode using U+2400.
\0
Positive Lookahead
Asserts that the given subpattern can be matched here, without consuming characters
(?=...)
Negative Lookahead
Starting at the current position in the expression, ensures that the given pattern will not match. Does not consume characters.
(?!...)
Positive Lookbehind
Ensures that the given pattern will match, ending at the current position in the expression. The pattern must have a fixed width. Does not consume any characters.
(?<=...)
Negative Lookbehind
Ensures that the given pattern would not match and end at the current position in the expression. The pattern must have a fixed width. Does not consume characters.
(?<!...)