CODEWITHSUNDEEP
javascript
Jack
Jack

Reputation: 6650

How to extract substring based on position of a character in JavaScript?

I have a String as following Jack_XX3_20 , I need to retrieve 20 based on position of XX3. I am using following code but it returns k_XX3

<!DOCTYPE html>
<html>
<body>

<p>Test The Code</p>

<button onclick="myFunction()">Try it</button>

<p id="demo"></p>

<script>
function myFunction() {
    var str = "Jack_XX3_20YYYG";
    var pos = str.indexOf("XX3");
    var n = str.substring(pos+3,3);
    document.getElementById("demo").innerHTML = n;
}
</script>

</body>
</html>
</script>

Upvotes: 0

Views: 863

Answers (3)

Arunprasanth K V
Arunprasanth K V

Reputation: 21961

Try this 

function myFunction() {
   var str = "Jack_XX3_20qjjjj";
    var pos = str.lastIndexOf("XX3_")+3;

    var pos = str.indexOf("XX3_")+4;
    var n = str.substring(pos,pos+2);
    document.getElementById("demo").innerHTML = n;
}

DEMO

Upvotes: 0

Dhiraj
Dhiraj

Reputation: 33628

Something like this ?

str.substring(str.indexOf("XX3")+4, str.length)

This is how you want to use substring

str.substring(indexA[, indexB])

indexA

An integer between 0 and the length of the string, specifying the offset into the string of the first character to include in the returned substring.

indexB

Optional. An integer between 0 and the length of the string, which specifies the offset into the string of the first character not to include in the returned substring.

Source: mdn

UPDATE

You are looking for a regex based on the comment

var str = "Jack_XX3_24930YYYG";
var reg = /XX3_(\+?\d+)/g;
var match = reg.exec(str);
alert(match[1]);

Upvotes: 4

Sney19
Sney19

Reputation: 123

This should work(Tested in JSFiddle): 

<button onclick="myFunction()">Try it</button>

<p id="demo"></p>

<script>
function myFunction() {
    var str = "Jack_XX3_20";
    var pos = str.indexOf("XX3_")+4;
    var n = str.substring(pos,str.length);
    document.getElementById("demo").innerHTML = n;
}
</script>

</body>

Upvotes: 0

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