JavaScipt ES6 RegExp Cheatsheet /pattern/flags
Special characters meaning
Boundaries
^
Start of string
$
End of string
\b
A word boundary
\B
Non-word boundary
Character classes
.
Any single character
\s
Any whitespace character
\S
Any non-whitespace character
\d
Any digit
\D
Any non-digit
\w
Any word character
\W
Any non-word character
\t
Tab
\r
Carrige return
\n
NewLine
\v
Vertical whitespace character
\f
Form-feed
[\b]
Backspace character (Not to be confused with \b)
\0
Null character
\cX
Control character X (X is a letter from A-Z)
\xhh
Hex character hh (two hexadecimal digits)
\uhhhh
Matches the unicode character with the given hex value (four hexadecimal digits)
\ddd
Octal character ddd
|Makes any character literal
\u{hhhh}
U+hhhh (only when u flag is set)
Quantifiers
a?
0 or 1 of a
a*
0 or more of a
a+
1 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
a*
Greedy quantifiers
a*?
Lazy quantifiers
Grouping and back references
(...)
Capture everything enclosed
(?:...)
Match everything enclosed (no capture group)
\n
Match nth subpattern (n=number)
Assertions
(?=...)
Positive lookahead
(?!...)
Negative lookahead
Character Sets
[abc]
A character of: a, b or c
[^abc]
A character except: a, b or c
[a-z]
A character in the range: a to z
[^a-z]
A character not in the range: a to z
[a-zA-z]
A character in the range: a to z or a-z
Alternation
(a|b)
Match either a or b
Flags/Modifiers
g
Global
m
Multiline
i
Case insensitive
u
Unicode
y
Sticky
RegExp
prototype
Allows the addition of properties to all objects.
lastIndex
The index at which to start the next match.
RegExp.prototype
flags
A string that contains the flags of the RegExp object.
global
Whether to test the regular expression against all possible matches in a string.
ignoreCase
Whether to ignore case.
multiline
Whether or not to search in strings across multiple lines.
source
The text of the pattern.
sticky
Whether or not the search is sticky.
unicode
Whether or not Unicode features are enabled.
RegExp.prototype
exec()
Executes a search for a match in its string parameter.
test()
Tests for a match in its string parameter.
[Symbol.match]
Performs match to given string and returns match result.
[Symbol.replace]
Replaces matches in given string with new substring.
[Symbol.search]
Searches the match in given string and returns the index the pattern found in the string.
[Symbol.split]
Splits given string into an array by separating the string into substring.
toString()
Returns a string representing the specified object.