使用正则表达式验证我们的电话号码

Question

I'm doing an exercise on freecodecamp for validate us telephone number.

The user may fill out the form field any way they choose as long as it is a valid US number. The following are all valid formats for US numbers:

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

I'm using RegEx to test input.I type these expression on regex101

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

to test input like:

2 ** (757) 622-7382** return true

- 1 (757) 622-7382 return true

10 ** (757) 622-7382** return true

How could I test the leading 2, minus sign and 10.

Answer 1

I would suggest you to have a look on OWASP Validation Regex Repository as they are subject of validation and continuous updates

For the US Phone (at the time I'm writing)the suggested RegEx is ^\\D?(\\d{3})\\D?\\D?(\\d{3})\\D?(\\d{4})$

Answer 2

((-)?\\d{0,2} )? Notice the space after {0,2}

(-)?       // may begin with a minus
(\d{1,2})?   // may have 1 or 2 digits before the actual number
( )?       // may have a space after that

DEMO

Answer 3

Here is a modified version of your regex that will now match the new phone formats:

^[-+]?(?:\d{1,2}\s)?\(*(?:\d{3})(?:-|\)|\)\s|\s)*\d{3}(?:-|\s)*\d{4}$

See demo

Note I removed the capture groups (I doubt you need them, and they create additional overhead) and added optional + or - before the number. Also, \\d{1,2} matches 1 or 2 digits due to the limiting quantifier {1,2} .

Answer 4

Might be a bit late but here is the solution to this one.

/^(1\s?)?(\(\d{3}\)|\d{3})[\s\-]?\d{3}[\s\-]?\d{4}$/;

You do want to have the ^ at the beginning of the expression to match the first char of the string and you want to use $ at the end to let the expression know that this is the end.

You can see the above answer and another way of doing it on the following github github link