Javascript: How to Extract a Number from a String Programming 04 JUL 2013

javascript logoIn my web development work, I’m quite fond of using the trick of generating grouped elements by making sure their IDs all share a common number with a bit of unique text.

So for example I could have a set of elements with the IDs accordionheading1, accordionpanel1, accordiontext1 and accordionheading2, accordionpanel2, accordiontext2. Now in order for this to be useful, I need to be able to extract the number from these strings so that I can automatically guess an element’s associated partners, meaning that you now know exactly what is coming next:

One of the easier ways of extracting a number from a string using javascript is by making use of a bit of regex, utilizing the digit negated shorthand character class \D to do our dirty work.

In practice:

var element = 'accordion24paneldrop';
id = element.replace( /\D+/g, '');
alert(id); //24


Check it else for yourself using JSFiddle! (JS Bin is pretty cool too)

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About Craig Lotter

South African software architect and developer at Touchwork. Husband to a cupcake baker and father to two little girls. I don't have time for myself any more.