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In the comments,
you can see the requirements for

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the phone number validation.

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Go ahead and pause this video,

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see if you can complete this function
before I show you my solution.

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One quick reminder though, don't forget
that parentheses are special characters.

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So to indicate you want to
match those literal characters,

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you need to escape them with a backslash,
like this or like that.

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Here's how I broke down this problem.

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I see three groups of numbers,
two groups of three and one group of four.

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So I'll type return.

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And three groups.

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And one group of four.

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There are some characters that we
want the user to type in though.

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Parentheses around the first group.

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So, \ (, and

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\), a space, and -.

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And we don't want any other
characters at the beginning or end.

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So I'll put a ^ and $ at either end.

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And we'll test, and pass in telephone.

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Save, and
if I test this out in the browser,

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We can see it works!

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Asking a user to format a phone
number is unnecessary though.

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I'll show you how you can format the phone
number automatically in a future video.

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Next let's validate the email address.