javascript: remove slash "extension" from string?

Question

What's the fastest method, to remove a specific extension from a String by not using regexp (.html, .htm, .xml or whatever you feed it with) ?

I need this to convert ~500 strings <1s at once.

example:

var myURL  = 'home/johndoe/likes/pepsico.html' 
var result = 'home/johndoe/likes/pepsico'

EDIT :

      var alias = window.location.pathname //'/home/johndoe/likes/pepsico.html' 

      alias = alias.substr(alias.indexOf('/') + 1)
      alias = alias.substr( 0, alias.lastIndexOf('.') );

how can i optimize this ?

Are regular expressions too slow? How long does your solution take so far? Have you had a look at string functions? (developer.mozilla.org/en/JavaScript/Reference/Global_Objects/…) — Felix Kling
– Felix Kling, Commented Aug 1, 2011 at 9:09
somebodfy told me, that regexp is a slow way and i should not use it ? O_o — mate64
– mate64, Commented Aug 1, 2011 at 9:11
Yes, regular expressions are slow compared to other string functions, but they might still be fast enough for your job. Implement something, profile it and then, if it is too slow, search for a faster solution. — Felix Kling
– Felix Kling, Commented Aug 1, 2011 at 9:13

jAndy · Accepted Answer · 2011-08-01 09:11:19Z

4

You don't even need a regular expression to do the job:

var myURL  = 'home/johndoe/likes/pepsico.html',
    myURL  = myURL.substr( 0, myURL.lastIndexOf('.') );

console.log( myURL );  // "home/johndoe/likes/pepsico"

answered Aug 1, 2011 at 9:11

jAndy

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mate64 Over a year ago

thank you (all) - this is my result (see above) - how can i optimize this ?

Salman Arshad · Accepted Answer · 2011-08-01 09:16:40Z

2

var myURL  = 'home/johndoe/likes/pepsico.html';
var result = myURL.substr(0, myURL.lastIndexOf("."));
// .substring() also works

Note: the above examples do not check if there is no . in the string.

answered Aug 1, 2011 at 9:16

Salman Arshad

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Comments

Pranay Rana · Accepted Answer · 2011-08-01 09:29:44Z

2

Make use of : JavaScript lastIndexOf() Method with JavaScript substring() Method

var myURL  = 'home/johndoe/likes/pepsico.html',
myURL  = myURL.substring(0, myURL.lastIndexOf('.'));
alert(myURL);

edited Aug 1, 2011 at 9:29

answered Aug 1, 2011 at 9:11

Pranay Rana

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1 Comment

jAndy Over a year ago

The answer would be perfect if those links would refer MDC instead of w3fools.

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