Regex validation for Phone Number

Question

I am trying to create a validation rule for US format number and using the following regex Validation

NOT(REGEX(Phone, "\\D*?(\\d\\D*?){10}"))

The above seems like a standard regex which will only allow saving for (000) 000-0000 format number.

However, if I enter characters in the following format (000) 000-0000yyy. It is still allowing save.

Answer 1

You can try the below one as this could make sure that the phone contains only numbers.

NOT( OR( ISBLANK(Phone), REGEX( Phone,"(\\D?[0-9]{3}\\D?)[\\s][0-9]{3}-[0-9]{4}")))

Answer 2

Phone validation is quite complex subject. You can check out the code and docs for libphonenumber to get some insight. I think using a libphonenumber port to parse/validate the number would give you a more precise result. I'm one of the authors of the library, so I can help you out in case you'll have any questions. Please note that regex will not handle all possible cases.

Answer 3

OR (AND ( NOT(ISBLANK(Phone)), OR (LEN ( Phone ) < 9, LEN( Phone ) > 15, NOT(REGEX(Phone, "[0-9 ]+"))) ) , AND ( NOT(ISBLANK(PersonMobilePhone)), OR (LEN ( PersonMobilePhone ) < 9, LEN( PersonMobilePhone ) > 15, NOT(REGEX(PersonMobilePhone , "[0-9 ]+"))) ) )