Question

I’d like to do a replace on a string that contains sq- or sq. I was thinking of doing something like this:

var imgSrc = event.dataTransfer.getData('Text');
    imgSrc = imgSrc.replace('sq-', 'mt-') || imgSrc.replace('sq.', 'mt.');

Any ideas on how I can get this working?

Answer 1

You could do it with one regex…

imgSrc = imgSrc.replace(/sq([.-])/g, 'mt$1');

jsFiddle.

The character class will match a literal . (because it loses its special meaning in a character class) and a literal - (doesn’t look like a range so it has no special meaning either).

The match is placed in capturing group 1, which is referenced in the replacement with $1.

Performance test between one regex and two.