Validate French phone numbers

To validate French phone numbers using Ruby, you can use regular expressions. Regular expressions are patterns used to match character combinations in strings. Here's an example of how you can validate French phone numbers using regular expressions in Ruby:

def validate_phone_number(phone_number)
  pattern = /^0[1-9]\d{8}$/

  if phone_number.match(pattern)
    return "Valid phone number"
  else
    return "Invalid phone number"
  end
end

phone_number = "0123456789"
puts validate_phone_number(phone_number)

Explanation: 1. The validate_phone_number method takes a phone number as an argument. 2. The pattern variable holds the regular expression pattern ^0[1-9]\d{8}$. - ^ indicates the start of the string. - 0 matches the digit 0. - [1-9] matches any digit from 1 to 9. - \d{8} matches any digit exactly 8 times. - $ indicates the end of the string. 3. The phone_number.match(pattern) checks if the phone number matches the pattern. 4. If the phone number matches the pattern, the method returns "Valid phone number". 5. If the phone number does not match the pattern, the method returns "Invalid phone number". 6. The phone number "0123456789" is passed to the validate_phone_number method and the result is printed.

This code uses a simple regular expression pattern to validate French phone numbers. It checks if the phone number starts with 0, followed by a digit from 1 to 9, and is then followed by exactly 8 digits. If the phone number matches this pattern, it is considered valid.