How do I convert this PHP regex to Javascript?

Question

I tried converting this:

$regex = "/^[0-9]+[0-9\.]*(?<!\.)$/"

to all of these, but none are correct:

var regex = /^(?!\.$)[0-9]+[0-9\.]*/;
var regex = /^(?!.*\.$)[0-9]+[0-9\.]*/;
var regex = /^[0-9]+[0-9\.]*(?!\.$)/;

The PHP regex correctly rejects 1.1a and 1., but the javascript regex's do not.

possible. I'm trying to get a string that has only numbers and dots and cannot end in a dot. — Don Rhummy
– Don Rhummy, Commented Jun 10, 2013 at 18:33

Paul · Accepted Answer · 2013-06-10 18:43:09Z

6

Your PHP Regex may be better written as the following, which matches the same language, but is easier to read and doesn't need to use a negative look-behind:

$regex = "/^\d+(\.\d+)*$/"

It is also easy to translate it directly to a Javascript regex:

var regex = /^\d+(\.\d+)*$/;

edited Jun 10, 2013 at 18:43

answered Jun 10, 2013 at 18:30

Paul

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