challenge: phone number

output.txt

# Task executed successfully.

# ---------------------------------
# Input parameters: ("0151-319723")
# Result: No
# OK
# ---------------------------------
# Input parameters: ("(123) 456-7890")
# Result: 1234567890
# OK
# ---------------------------------
# Input parameters: ("(137) 811-0877")
# Result: 1378110877
# OK
# ---------------------------------
# Input parameters: ("(66) 030-2617")
# Result: No
# OK

No
1234567890
1378110877
No

phone_number.rb

# frozen_string_literal: true

# You are for a customer support center and have been asked to help update the company's extensive phone directory.

# In order to check which phone numbers are still valid and which need updating, you need to write a short program that:

# - Checks wether a phone number (given as string str) in the database is in the format (XXX) XXX-XXXX. And then
# - If the number is in the correct format, returns it as a continues 10-digit string (called convertNumber)
# - If the number is not in the correct format, returns "No"

# Take the following into account:

# 1 <= |str| <= 100

# Example 1:

# Input: (123) 456-7890
# Output: 1234567890

# Explanation

# Since the input is in the correct format, your code will convert it into a continuous 10-digit string. The outcome,
# therefore, is 1234567890.

# Example 2:

# Input: 0151-319723
# Output: No

# Explanation:

# Since the input is not in the correct format, your code will return the output No.

def convert_number(str)
  regex = str.match(/\((\d{3})\) (\d{3})-(\d{4})/)
  return 'No' unless regex

  regex.captures.join
end

puts convert_number('0151-319723')
puts convert_number('(123) 456-7890')
puts convert_number('(137) 811-0877')
puts convert_number('(66) 030-2617')