[Code] Regular expressions for C # and JS

Metacharacters

Single character:. []

Qualifier: * +? {n} {N,} {n,m}

Tail: ^ $ '

Other: | ()

Regular expressions are available in both JS and C #.

　　

In C #:

Create:

var regex = new Regex ("\\d");

　　

The:

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");

Extraction:

Syntax: MatchCollection Matches (String input)

var mts = regex. Matches (str);

　　　　

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JS in:

Create:

var regex = new RegExp (' \\d '); \ \ Need to escape note: I,m,g for ignoring case, matching multiple lines, global matching

var regex =/\d/; Literal methods do not need to be escaped

The:

Boolean regexp.test (String);

var str = ' A1B1C1 ';　　var regex =/\d/;　　　　Alert (Regex.test (str)); Popup true, match to number

Replace:

var str = ' A1B1C1 '; Str.replace (/(\d). * (\d)/, ' $2,$1 ') results: a1,1 $ and $ $ represent the first and second results matched to each other.

Extraction:

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

var str = ' A1B1C1 ';　　var regex=/\d/;　　var objs = regex.exec (str); Result: objs[0] = 1

[Code] Regular expressions for C # and JS