从电话号码中删除特殊字符和+1

Question

I've been trying to validate phone numbers to the format 5555555555. I've successfully been able to strip the phone number of all special characters, but if a phone number is entered with [phone], the number still contains '1' at the beginning of the number. Is there anyway to remove both the +1 and special characters?

My current regex is preg_replace('/^1|\D/', "", [phone]);.

Any help would be appreciated!

Answer 1

You don't need a regular expression for this.

str_replace('+1', '', $string)

will do it. However to explain why your regex currently fails, your string doesn't start with 1, it starts with +1 so ^1 is not a match.

Demo of current usage: https://regex101.com/r/kwwp1r/1/

Demo of a possible regex solution: https://regex101.com/r/kwwp1r/2/

^\+1