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Validate a phone number, ensuring that it's entered following the pattern `(555) 555-5555`.
In the comments,
you can see the requirements for
0:00
the phone number validation.
0:02
Go ahead and pause this video,
0:05
see if you can complete this function
before I show you my solution.
0:07
One quick reminder though, don't forget
that parentheses are special characters.
0:12
So to indicate you want to
match those literal characters,
0:18
you need to escape them with a backslash,
like this or like that.
0:21
Here's how I broke down this problem.
0:29
I see three groups of numbers,
two groups of three and one group of four.
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So I'll type return.
0:39
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 -.
1:02
And we don't want any other
characters at the beginning or end.
1:09
So I'll put a ^ and $ at either end.
1:11
And we'll test, and pass in telephone.
1:19
Save, and
if I test this out in the browser,
1:24
We can see it works!
1:37
Asking a user to format a phone
number is unnecessary though.
1:38
I'll show you how you can format the phone
number automatically in a future video.
1:42
Next let's validate the email address.
1:48
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