Regular expressions of [Code] C # and js

Metacharacters:

Single character:. []

Qualifier: * +? {n} {n,} {nrecom}

Head and tail: ^ $'

Other: | ()

Regular expressions are available in both js and C #.

In C #:

Create:

Var regex = new Regex ("\\ d")

Match:

Syntax: bool IsMatch (string input)

Var b = regex.IsMatch (str)

Replace:

Syntax: static string Replace (string input, string pattern, string replacement)

Var str = Regex.Replace (str, "\ d", "number")

Extract:

Syntax: MatchCollection Matches (string input)

Var mts = regex.Matches (str)

=

In JS:

Create:

Var regex = new RegExp ('\\ d');\\ need to escape remarks: iParticipate the case, match multiple lines, and match globally.

Var regex = /\ d bind; literal quantity does not need to be escaped

Match:

Boolean RegExp.test (string)

Var str = 'a1b1c1cards; var regex = /\ d str; alert (regex.test (str)); / / pop-up true to match to the number

Replace:

Var str = 'a1b1c1century; str.replace (/ (\ d). * (\ d) /,' $2jin1') result: a 1JI $1 and $2 represent the first and second matching results.

Extract:

Objs RegExp.exec (str) returns an array-like object

Var str = 'a1b1c1cards; var regex=/\ d str; var objs = regex.exec (str); result: objs [0] = 1