How would you write a regular expression that defines a phone number:  ex. 
In other words how would you check to see if there were three numerics surrounded by 
(), then three numerics with a "-", then four numerics.
This is what I have so far as a regular expression.
I am using this in an if statement like this:
If (!eregi("^[(000-999)]+[000-999\-]+[0000-9999]+$", $PHONENUMBER)
echo "This phone number is not valid";
Any help is appreciated.
Kris Vose

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