JavaScript String Object Methods

Methods of String Object

Method 1: indexOf() (recommended)

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

The indexOf() method returns the position of the first occurrence of a specified string value within a string. If the string value to be retrieved does not appear, the method returns -1.

Method 2: search()

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

The search() method is used to search for a specified substring in a string, or to search for a substring that matches a regular expression. If no matching substring is found, -1 is returned.

Method 3: match()

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

The match() method retrieves a specified value within a string, or finds matches for one or more regular expressions.

RegExp Object Methods

Method 4: test()

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

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

Method 5: exec()

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

The exec() method is used to retrieve matches of a regular expression within a string. Returns an array containing the matching results. If no match is found, the return value is null.

Summarize

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