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This will see if the user entered the correct syntax for an email address. should except email as the folowing:

test_@abc.abc

or

_test@abc.com

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none

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if (!preg_match('/^[-!#$%&'*+\./0-9=?A-Z^_`{|}~]+@([-0-9A-Z]+.)+([0-9A-Z]){2,4}$/i', $email)) { 
  echo("<br><b>Your email doesn't seem to be valid. </b>"); 
}