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Editorial Team
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Asked: 2026-06-12T21:14:12+00:00

I am trying to replace a string var url = www.fnord.com/foo/bar/btn_close_white.gif; Simple word for

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I am trying to replace a string 

var url = "www.fnord.com/foo/bar/btn_close_white.gif";

Simple word for word for word replacement works fine:

var newUrl = url.replace(/btn_close_white.gif/g,"btn_close_black.gif");

Yet since I do not know what color is currently set, I need the regex to ignore the color part and replace the whole segment. So that in theory, btn_close_pink.gif or btn_close_someOtherFancyColor.gif all get replaced to btn_close_black.gif.

I tried this, but it fails and I do not know why:

var newUrl = url.replace(/btn_close_*.gif/g,"btn_close_black.gif"); // this fails

What am I doing wrong?

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1 Answer

  1. Editorial Team

    Try this:

    var url = "www.fnord.com/foo/bar/btn_close_white.gif";
var newUrl = url.replace(/btn_close_[\w\d]*\.gif/g,"btn_close_black.gif");

    Regexp [\w\d]* means any amount of letters or digits. If you allow any characters in url do this:

    var newUrl = url.replace(/btn_close_.*\.gif/g,"btn_close_black.gif");

    EDIT: When your write "/btn_close_*\.gif/" regexp this means that your string should contain “btn_close” string + any amount of “_” character + “.gif” string.

    When your write "/btn_close_.*\.gif/" regexp this means that your string should contain “btn_close” string + any amount of any characters + “.gif” string.

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