What am I getting wrong?(Form validation)

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PHP

The following is a part of a form validation code. The code segment is supposed to validate URL's.

else if($Key == "Website" || $Key == "Destination" || $Key == "Source")
							{
								if (!preg_match("/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-zA-Z0-9+&@#\/%=~_|]/i",	$Data[$Key]))
								{
									$Error[$Key] = "Invalid URL.";
									$Return = 1;
								}
							}

Debugging effort shows that the code reports an error when it reads the following URL from form inputs:

<input type="hidden" value="GetAffiliatelink.php" name="Destination"/>
								<input type="hidden" value="ProductAffiliate.php#Promote%20School%20Pedestal" name="Source"/>

Please why is it stating that the url's are not valid. I have been looking at the code for hours and can't find any bug. Can someone kindly help me give it a look?