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Clean up user-entered phone numbers so that they can be sent SMS messages. The **North American Numbering Plan (NANP)** is a telephone numbering system used by many countries in North America like the United States, Canada or Bermuda. All NANP-countries share the same international country code `1`. NANP numbers are ten-digit numbers consisting of a three-digit Numbering Plan Area code, commonly known as *area code*, followed by a seven-digit local number. The first three digits of the local number represent the *exchange code*, followed by the unique four-digit number which is the *subscriber number*. The format is usually represented as ``` (NXX)-NXX-XXXX ``` where N is any digit from 2 through 9 and X is any digit from 0 through 9. Your task is to clean up differently formated telephone numbers by removing punctuation and the country code (1) if present. **Example:** +1 (613)-995-0253 613-995-0253 1 613 995 0253 613.995.0253 - - - - - - - - - - - - - 6139950253 **Note:** As this exercise only deals with telephone numbers used in NANP-countries only 1 is considered a valid country code.
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29 entries across 29 versions & 1 rubygems