Removing the last digits in string

Question

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?

@ameyarote: The OP states "16 digits" in the example, so it would be the former. (But the length is not fixed, as stated in the last sentence.) — MrWhite
– MrWhite, Commented Nov 26, 2012 at 12:17
@w3d: Ok..! please check the answer which I suggeted below it exactly removes all the last numbers.(Please check and tell if any diffent thing is required) — ameya rote
– ameya rote, Commented Nov 26, 2012 at 12:28

bjornd · Accepted Answer · 2012-11-26 11:33:03Z

7

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]+$/, '');

answered Nov 26, 2012 at 11:33

bjornd

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Comments

Alberto De Caro · Accepted Answer · 2012-11-26 11:34:51Z

2

Instead of substr, use replace and a regular expression:

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

Running demo here.

References at MDN here.

answered Nov 26, 2012 at 11:34

Alberto De Caro

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1 Comment

MrWhite Over a year ago

Although this isn't necessarily "at the end of the string". You will need an anchor $ to mark the end of the string.

Gavin · Accepted Answer · 2012-11-26 11:44:01Z

2

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))

answered Nov 26, 2012 at 11:44

Gavin

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2 Comments

MrWhite Over a year ago

But according to the OP, the length of the string to be removed varies.

Gavin Over a year ago

Ah, apologies, I thought the OP meant the prefixed string was the variable length string. @ADC's suggestion would be better in this case.

Onur Topal · Accepted Answer · 2012-11-26 11:33:09Z

1

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);

answered Nov 26, 2012 at 11:33

Onur Topal

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1 Comment

MrWhite Over a year ago

Although the OP states, "will have different amount of characters" - so it's not always 16 chars that need to be removed.

MarcoK · Accepted Answer · 2012-11-26 11:36:22Z

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.

Hkachhia · Accepted Answer · 2012-11-26 11:36:57Z

0

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);

answered Nov 26, 2012 at 11:36

Hkachhia

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Comments

ameya rote · Accepted Answer · 2012-11-26 12:39:23Z

0

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 ?

edited Nov 26, 2012 at 12:39

answered Nov 26, 2012 at 11:37

ameya rote

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