Special characters Flashcards
.
matches any single character except line terminators
\d
matches any digit === [0-9]
\D
matches any non digit
\w
matches any alphanumeric character from basic latin alphabet including underscore
\W
matches any character that is not a word character from the basic latin alphabet
\s
matches a single white space character
\S
matches a single character other than white space
\t
matches a horizontal tab
\r
matches a carriage return
\n
matches a linefeed
\v
matches a vertical tab
\f
matches a form-feed
[\b]
matches a backspace
\0
matches a NUL character
\cX
where X is a letter from A-Z, matches a control character in a string
\xhh
matches the character with code hh(two hexadecimal digits)
\uhhhh
matches a UTF-16 code-unit with the value hhhh(four hexadecimal digits)
\
indicates that the next character is special and not to be interpreted literally
[xyz] [a-c]
matches any one of enclosed characters can specify range with hyphen, hyphen can be literal if at end
[^xyz]
negated or complemented character set
x|y
matches either x or y
matches beginning of input
$
matches end of input
\b
matches a word boundary (i.e start or end)
\B
matches a non-word boundary
(x)
matches x and remembers match, capturing groups
\n
where n is positive integer, back reference to last substring matching the n
(?:x)
matches x but does not remember, non capturing groups
x*
matches the preceding item x 0 or more times
x+
matches the preceding item x 1 or more times === {1,}
x?
matches preceding item x 0 or 1 time
x{n}
where n is a positive integer matches exactly n occurences of the preceding item x
x{n,}
where n is a positive integer matches at least n occurences
x{n,m}
matches at least n and at most m of x
?
matches preceding item but smallest possible
x(?=y)
matches x only if followed by y
x(?!y)
matches x only if x is not followed by y
compile()
compiles reg expression during execution of a script
exex()
executes a search for a match in its string parameter
test()
tests for a match in its string parameter
match()
performs match to given string and returns match result
replace()
replaces matches in given string with new substring
search()
searches match in given string and returns index
split()
splits given string into an array by separating the string into substring
lastIndex
returns last index of reg expression
