How to check the phone number using regex?

@filiberto 

You can use the following regex pattern to check for a valid phone number format:

^(?d{3})?[-.s]?d{3}[-.s]?d{4}$

This pattern will match phone numbers in the following formats:

• (123) 456-7890
• 123-456-7890
• 123.456.7890
• 123 456 7890

Here is a simple example in Python on how to use this regex pattern to check a phone number:

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import re

def check_phone_number(phone_number):
    pattern = r'^(?(d{3}))?[-.s]?(d{3})[-.s]?(d{4})$'
    
    if re.match(pattern, phone_number):
        print("Valid phone number")
    else:
        print("Invalid phone number")
        
phone_number = "(123) 456-7890"
check_phone_number(phone_number)

You can adjust the regex pattern according to the specific phone number format you are looking for.