Javascript中具有正则表达式的无效组

Question

I've looked around for solutions to my problem but I cannot see what part of my regex expression is invalid (javascript says that I have an invalid group). I imagine that I am using something which isn't support by javascript's regex engine?

I'm trying to validate US phone numbers like the following:

555-555-5555
(555)555-5555
(555) 555-5555
555 555 5555
5555555555
1 555 555 5555

And my expression for validations is:

1?[\s-]?\(?(\d{3})\)?[\s-]?(\d{3})[\s-]?(\d{4})

Any tips?

Answer 1

/1?[\\s-]?\\(?(\\d{3})\\)?[\\s-]?(\\d{3})[\\s-]?(\\d{4})/ works fine in JavaScript.

However, my crystal ball says you're using a string that you're passing to the RegExp constructor:

new RegExp("1?[\s-]?\(?(\d{3})\)?[\s-]?(\d{3})[\s-]?(\d{4})")

This is wrong because backslashes have a special meaning in strings, so

"1?[\s-]?\(?(\d{3})\)?[\s-]?(\d{3})[\s-]?(\d{4})"

is equivalent to

"1?[s-]?(?(d{3}))?[s-]?(d{3})[s-]?(d{4})"

(because "\\(" is "(" ). That would complain about an invalid group at (?( .

Solution: Either use a regex literal ( /.../ ) or double your backslashes in the string.

Answer 2

你试过下面的吗？

^\([0-9]{3}\)[0-9]{3}-[0-9]{4}$