PHP Regular expression is validating, but the javascript is not

Question

I am trying to write some reg expression validation on a PHP form, and I have the following:

/^([+]{1}[0-9]{1,2}[\s]?[0-9]{1,10}[\s][0-9]{1-6}?)|([+][0-9]{1,2}[\s]?[0-9]{1,4}[\s]?[0-9]{1,6})|([+]?[0-9]{2,3}?[\s]?[0-9]{1,3}[\s])?([0-9]{1,5})?[0-9]{3}[\s]?[0-9]{5,6}$/i

but the javascript version shown below is claiming it not to be valid, even though I can successfully submit the form showing that the PHP version will accept the expression.

/^([+][0-9]{1,2}[\\s]?[0-9]{1,10}[\\s][0-9]{1-6}?)|([+][0-9]{1,2}[\\s]?[0-9]{1,4}[\\s]?[0-9]{1,6})|([+]?[0-9]{2,3}?[\\s]?[0-9]{1,3}[\\s])?([0-9]{1,5})?[0-9]{3}[\\s]?[0-9]{5,6}$/i

Thanks in advance for your help.

Answer 1

Because you're trying to escape \\ by \\\\ , which is not needed

And you should escape + by \\+ if you are trying to match the literal +