Summary of methods to use JS to determine the content contained in a string

This time I will bring you a summary of the method of using JS to determine the content contained in a string. What are theprecautionsfor using JS to determine the content contained in a string. The following is a practical case. , let’s take a look.

String object methods

Method 1: indexOf() (recommended)

var str = "123" console.log(str.indexOf("2") != -1); // true

Method 2: match()

var str = "123" var reg = RegExp(/3/); if(str.match(reg)){ //包含； }

The match() method can retrieve the specified value within the string, or find one or more A match ofregular expression.

Method 3: search()

var str = "123" console.log(str.search("2") != -1); // true

Methods of RegExp object

var str = "123" var reg = RegExp(/3/); console.log(reg.test(str) != -1); // true

The test() method is used to retrieve the value specified in a string. Returns true or false.

var str = "123" var reg = RegExp(/3/); if(reg.exec(str)){ //包含； }

exec() methodis used for retrieval Regular expression matching in strings. Returns an array containing the matching results. If no match is found, the return value is null.I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!

Recommended reading:

The above is the detailed content of Summary of methods to use JS to determine the content contained in a string. For more information, please follow other related articles on the PHP Chinese website!