Question

I’ve got a form on a website with a bunch of input elements. The name attribute for these elements is of the form “property-0”. However, the user may need multiple fieldsets just like the current one, so I clone the fieldset with jQuery clone(), but then I need to increment the number on the end. The number could be above 10, so I can’t just select the last character.

This is what I am trying:

name.replace(/([0-9]+)$/, String(Number('$1')+1));

but it just gives me property-NaN. Anyone know what I’m doing wrong?

Answer 1

You can pass a function in as the second argument to .replace(), like this:

name.replace(/([0-9]+)$/,function(a, m) { return +m+1; });

You can test it out here, feel free to replace +m with parseInt(m, 10) if you’re mor comfortable with that.