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Contents

# Phone Number

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.

For example, the inputs
- `+1 (613)-995-0253`
- `613-995-0253`
- `1 613 995 0253`
- `613.995.0253`

should all produce the output

`6139950253`

**Note:** As this exercise only deals with telephone numbers used in NANP-countries, only 1 is considered a valid country code.

* * * *

For installation and learning resources, refer to the [exercism help page][].

[exercism help page]: http://exercism.io/languages/lfe

To run the provided tests, you will need `make`.
Open a terminal window and run the following from the exercise directory:

```sh
make test
```

You should now be able to see the results of the test suite for the exercise.

## Source

Event Manager by JumpstartLab [http://tutorials.jumpstartlab.com/projects/eventmanager.html](http://tutorials.jumpstartlab.com/projects/eventmanager.html)

## Submitting Incomplete Solutions
It's possible to submit an incomplete solution so you can see how others have completed the exercise.

Version data entries

106 entries across 106 versions & 1 rubygems

Version Path
trackler-2.2.1.70 tracks/lfe/exercises/phone-number/README.md
trackler-2.2.1.69 tracks/lfe/exercises/phone-number/README.md
trackler-2.2.1.68 tracks/lfe/exercises/phone-number/README.md
trackler-2.2.1.67 tracks/lfe/exercises/phone-number/README.md
trackler-2.2.1.66 tracks/lfe/exercises/phone-number/README.md
trackler-2.2.1.65 tracks/lfe/exercises/phone-number/README.md
trackler-2.2.1.64 tracks/lfe/exercises/phone-number/README.md
trackler-2.2.1.63 tracks/lfe/exercises/phone-number/README.md
trackler-2.2.1.62 tracks/lfe/exercises/phone-number/README.md
trackler-2.2.1.61 tracks/lfe/exercises/phone-number/README.md
trackler-2.2.1.60 tracks/lfe/exercises/phone-number/README.md
trackler-2.2.1.59 tracks/lfe/exercises/phone-number/README.md
trackler-2.2.1.58 tracks/lfe/exercises/phone-number/README.md
trackler-2.2.1.57 tracks/lfe/exercises/phone-number/README.md
trackler-2.2.1.56 tracks/lfe/exercises/phone-number/README.md
trackler-2.2.1.55 tracks/lfe/exercises/phone-number/README.md
trackler-2.2.1.54 tracks/lfe/exercises/phone-number/README.md
trackler-2.2.1.53 tracks/lfe/exercises/phone-number/README.md
trackler-2.2.1.52 tracks/lfe/exercises/phone-number/README.md
trackler-2.2.1.51 tracks/lfe/exercises/phone-number/README.md