Searching if my string contain particular substring

Question

I want to check if my string contain particular substring.

1.What function should i use to perform this in javascript or jquery or using regex

for example

var a = "i am string";
var b = "i am webpage";

if(var_a_has_string)
{
 alert("it is string")
}

if(var_b_has_webpage)
{
alert("it is webpage")
}

sorry for repetition being a beginner i found some similar question but did not get the given answers here

https://stackoverflow.com/questions/5038105/checking-if-a-string-contains-a-certain-substring

Fastest way to check a string contain another substring in Javascript?

2.which function to be used if i want to retrieve the particular substring from my string

like "webpage" string or "string" string

for example

var a = "i am string";
var b = "i am webpage";

if(var_a_has_string)
{
 var c = get_string_from_a(a)
}

if(var_b_has_webpage)
{
 var d = get_webpage_from_b(b)
}

What didn't you understand in the answers to those questions? — Rohit Jain, Sep 12 '13 at 14:38
possible duplicate of [Method like String.contains() in JavaScript](http://stackoverflow.com/questions/1789945/method-like-string-contains-in-javascript) — Aaron Kurtzhals, Sep 12 '13 at 14:44
sorry i just edited my question i needed to get the substring and store in another variable @RohitJain — Hitesh, Sep 12 '13 at 14:44
If you need the substring you're checking for why do you need a function to get it? You already know what it is... — bluetoft, Sep 12 '13 at 14:48
@bluetoft :hmmm i get ur point i can just check if it has that "str" string and if it has it using index of and if it has than i can assign the substring to my variable !!!! now when u r saying it this question feels really stupid !! thanks for the insight in it — Hitesh, Sep 12 '13 at 15:15

score 1 · Accepted Answer · answered Sep 12 '13 at 14:42

Just like the other answers.. string.indexOf is what you're looking for. It tells you the location of the substring within the string you're checking. -1 for not found.

var stringToCheck = "i am stringpage";

var a = "i am string";
var b = "i am webpage";

if(stringToCheck.indexOf(a) > -1){
     alert("it is string")
}

if(stringToCheck.indexOf(b) > -1){
   alert("it is webpage")
}

JSFIDDLE

score 0 · Answer 2 · answered Sep 12 '13 at 14:39

0

You can use the javascript function "indexOf"

It returns an integer, and -1 if the string hasn't been found.

 if (yourString.indexOf("stringToCheck") >= 0){
     //Insert some logic here
 }

answered Sep 12 '13 at 14:39

Deblaton Jean-Philippe

11,188
3
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Thanks!! can u check my edited question and ans it accordingly – Hitesh Sep 12 '13 at 14:46

score 0 · Answer 3 · answered Sep 12 '13 at 14:47

0

As mentioned, indexOf is what you need.

The MDN documentation: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/indexOf

answered Sep 12 '13 at 14:47

score 0 · Answer 4 · answered Dec 13 '15 at 16:58

To check if string contains another substring using Javascript use the below code

var str = "Hello world, welcome to Javascript Coding.";
var n = str.indexOf("welcome");

//Returns 13

var s = "foo";
console.log(s.indexOf("oo") > -1)

//returns true

The other way to do the same thing is using includes

var str = "Hello World, Welcome to Javascript Coding";
console.log(str.includes("Welcome to"));    // true
console.log(str.includes("Javascript")); // true
console.log(str.includes("To be", 1)); // false

Searching if my string contain particular substring

4 Answers4