CODEWITHSUNDEEP
javascript
Ruriko
Ruriko

Reputation: 179

Removing the last digits in string

I have a string that looks like this:

[APPLE PIE] Sei Shoujo Sentai Lakers 3 Battle Team Lakers 3 (100% FULL-PIC)_20121104_032834

I want to remove the digits at the end of the string, basically the 16 digits at the end of the string. In the end it should look like this:

[APPLE PIE] Sei Shoujo Sentai Lakers 3 Battle Team Lakers 3 (100% FULL-PIC)

This is my code that I have written so far

var str="[APPLE PIE] Sei Shoujo Sentai Lakers 3 Battle Team Lakers 3 (100% FULL-PIC)_20121104_032834";
var n=str.substr(1,74);
document.write(n);

The problem is the string will be different so each will have different amount of characters. So how I remove the digits at the end of the string in javascript?

Upvotes: 2

Views: 4715

Answers (7)

ameya rote
ameya rote

Reputation: 1114

Check this function

Check Example - http://jsfiddle.net/QN68Q/1/

<!DOCTYPE html> 
<html> 
<body onload="check();"> 

<script>
function check()
{
var theImg= "[APPLE PIE] Sei Shoujo Sentai Lakers 3 Battle Team Lakers 3 (100% FULL-PIC)_20121104_032834";

var x = theImg.split("_");
alert(""+x[0]);
}
</script> 
</body> 
</html>

it remove last numbers , is this what you required ?

Upvotes: 0

Gavin
Gavin

Reputation: 6394

Using slice you can use negative indexes.

http://jsfiddle.net/gRoberts/A5UaJ/2/

var str="[APPLE PIE] Sei Shoujo Sentai Lakers 3 Battle Team Lakers 3 (100% FULL-PIC)_20121104_032834";
alert(str.slice(0, -16))​

Upvotes: 2

Hkachhia
Hkachhia

Reputation: 4539

Try this

var str="[APPLE PIE] Sei Shoujo Sentai Lakers 3 Battle Team Lakers 3 (100% FULL-PIC)_20121104_032834";
var find=str.indexOf('_');
find=find-1;
var n=str.substr(1,find);
document.write(n);

Upvotes: 0

MarcoK
MarcoK

Reputation: 6110

Here are a couple of solutions:

var str="[APPLE PIE] Sei Shoujo Sentai Lakers 3 Battle Team Lakers 3 (100% FULL-PIC)_20121104_032834";

// Solution 1
// Ugly, since you don't know the number of characters
var n = str.substr(0, 75); // Take note these variables are different than yours!
document.write(n);
document.write("<br />");

// Solution 2
// Only works when the string itself contains no underscores
var n2 = str.split("_")[0];
document.write(n2);
document.write("<br />");

// Solution 3
// Only works if the last amount of numbers are always the same
var n3 = reverse(str);
n3 = n3.substr(16, n3.length);
n3 = reverse(n3);
document.write(n3);

function reverse(s){
    return s.split("").reverse().join("");
}​

JSFiddle.

Upvotes: 1

Alberto De Caro
Alberto De Caro

Reputation: 5213

Instead of substr, use replace and a regular expression:

str.replace(/_\d{8}_\d{6}/,'')

Running demo here.

References at MDN here.

Upvotes: 2

Onur Topal
Onur Topal

Reputation: 3061

just change your code to calculate the index according to the string length the following code should do the trick.

myString.substr(0, myString.length - 16);

Upvotes: 1

bjornd
bjornd

Reputation: 22943

If it is always exactly 16 digits in the end of the string then:

s = s.substr(0, s.length - 16);

Otherwise you can use regexp:

s = s.replace(/[_0-9]+$/, '');

Upvotes: 7

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