cashbooktw / js-es6-regexp-cheatsheet

JavaScipt ES6 RegExp Cheatsheet

資料來源：MDN JavaScript RegExp

資料整理：cashbook

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Syntax

/pattern/flags
new Regexp(pattern[,flags])

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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

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Properties

	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.

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Methods

	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.