JavaScript regular expressions, jquery regular Expressions __ Regular expressions

http://zhangyanyansy.blog.163.com/blog/static/135305097201042110756638/

Basic knowledge of JavaScript regular expressions

1 JavaScript regular object creation and usage declaration JavaScript regular Expressions

var recat = new RegExp ("cat");

You can also

var recat =/cat/; Perl Style (recommended)

2 learning the most commonly used test exec match search replace split 6 methods

1 Test checks to see if the specified string exists

var data = "123123″;"

var recat =/123/gi;

Alert (recat.test (data)); Tr

Check to see if the character is present G continue to go down I case insensitive

2 Exec return query value

var data = "123123,213,12312,312,3,cat,cat,dsfsdfs,";

var recat =/cat/i;

Alert (recat.exec (data)); Cat

3 Match Gets the query array

var data = "123123,213,12312,312,3,cat,cat,dsfsdfs,";

var recat =/cat/gi;

var arrmactches = Data.match (recat)

for (Var i=0;i < arrmactches.length; i++)

{

Alert (Arrmactches[i]); Cat Cat

}

4 Search to return to a location similar to IndexOf

var data = "123123,213,12312,312,3,cat,cat,dsfsdfs,";

var recat =/cat/gi;

Alert (Data.search (Recat)); 23

5 Replace replacement character using regular substitution

var data = "123123,213,12312,312,3,cat,cat,dsfsdfs,";

var recat =/cat/gi;

Alert (Data.replace (Recat, "libinqq"));

6) split using a regular split array

var data = "123123,213,12312,312,3,cat,cat,dsfsdfs,";

var recat =/\,/;

var arrdata = Data.split (recat);

for (var i = 0; i < arrdata.length; i++)

{

Alert (Arrdata[i]);

}

3 Learning under the simple class negative class range class combination class

Simple class

var data = "1LIBINQQ,2LIBINQQ,3LIBINQQ,4LIBINQQ";

var recat =/[123]libinqq/gi;

var arrdata = Data.match (recat);

for (var i = 0; i < arrdata.length; i++)

{

Alert (Arrdata[i]); 1LIBINQQ 2LIBINQQ 3LIBINQQ

}

Negative to Class

var data = "ALIBINQQ,1LIBINQQ,2LIBINQQ,3LIBINQQ,4LIBINQQ"; \ 拏

var recat =/[^a123]libinqq/gi;

var arrdata = Data.match (recat);

for (var i = 0; i < arrdata.length; i++)

{

Alert (Arrdata[i]); 4libinqq

}

Scope class

var data = "Libinqq1,libinqq2,libinqq3,libinqq4,libinqq5″;" \ 拏

var recat =/libinqq[2-3]/gi;

var arrdata = Data.match (recat);

for (var i = 0; i < arrdata.length; i++)

{

Alert (Arrdata[i]); LIBINQQ2 libinqq3

}

Combination Class

var data = "A,b,c,w,1,2,3,5″;" \ 拏

var recat =/[a-q1-4\n]/gi;

var arrdata = Data.match (recat);

for (var i = 0; i < arrdata.length; i++)

{

Alert (Arrdata[i]); A b C 1 2 3

}

These are JS is the most basic method of use.

Second, the jqry regular expression processing

1.test method

reg=/^\w{3,}@\w+ (\.\w+) +$/;

2	if (!reg.test (obj)) {

3	$ ("#test"). HTML ("<b> Please enter the correct email address </b>");

4

}

2.exec method

$.formatdate.patternparts =/^ (yy (yy)? | M (m (m)?)? | D (d)? | EEE (E)? | a| H (h)? | H (h)? | M (m)? | s (s)? | S)/;

2	var matched = $.formatdate.patternparts.exec (pattern);

3	if (matched) {

4	Null if conforming to matched array index:0

5	Result.push (this,date) ($.formatdate.patternval[matched[0]].call);

6	Pattern = Pattern.slice (matched[0].length);

7

}