is_numeric and casting

[piers]

I have tried using is_numeric to validate some form data to make sure it is only numbers that are entered into the form. I couldnt get it to work so I decided to try and put a-z\A-Z in preg_match.
I cannot get either of them to work although there are no code errors. The both go to my ow created error message even when I enter a number in the form. Incase that number was a string I tried casting it to an int to be double sure that it was a number. So I am at a loss as to why is_numeric and the preg_match with the a-z\A-Z in it go to my error. Any ideas would be helpful.

This is my code

<?php
		include ("conn.php");
		$uniqueT=TRIM($_POST['uniqueidT']);
		$fnameT=TRIM($_POST['fnameT']);
		$snameT=TRIM($_POST['snameT']);
		$tottreat=TRIM($_POST['tottreatT']);
		$treatcom=TRIM($_POST['trtcomT']);
		$ampay=TRIM($_POST['ampayT']);
		$filelink=TRIM($_POST['filelink']);
		
		$uniqueT= mysql_real_escape_string($uniqueT);
		$fnameT= mysql_real_escape_string($fnameT);
		$snameT= mysql_real_escape_string($snameT);
		$tottreat= mysql_real_escape_string($tottreat);
		$treatcom= mysql_real_escape_string($treatcom);
		$ampayT= mysql_real_escape_string($ampayT);
		$filelinkT= mysql_real_escape_string($filelinkT); 
		
		
		$sqlmm= "INSERT into person_info(unique_number, first_name,surname,treatments_completed,total_treatments,amount_paid,file_link) values ('$uniqueT' , '$fnameT' , '$snameT' , '$treatcom', '$tottreat' , '$ampay' , '$filelink' )";
		
		 $treatint = (int)$treatcom;
if (strlen($uniqueT) == 0 or preg_match("/[&<>%\*\,\.^#\'\"]/$£", $uniqueT))
		{
			echo "error you have not entered data for unique ID or you have entered a special character <br/>";
			echo "<a href='laserclearentry.html'>click here to go back</a> ";
		}
else if(strlen($treatcom) == 0 or preg_match("/[&<>%\*\,\.^#\'\"\A-Z\a-z]/$£", $treatint))
		{
			echo "error you have not entered data for treatments completed or you didnt enter numbers or you have entered a special character<br/>";
			echo "<a href='laserclearentry.html'>click here to go back</a> ";
			echo "here".$treatcom;
		} 
else
		{
		mysql_query($sqlmm) or die(mysql_error());
			
		echo "data successfully entered into the database <br/>";
		echo "<a href='laserclearentry.html'> click here to go back to entry page</a>";
		}
 mysql_close($conn);
	?>

[sourcebits]

if(strlen($uniqueT) == 0 or !is_numeric($uniqueT))
works with us fine

[piers]

if(strlen($uniqueT) == 0 or !is_numeric($uniqueT))
works with us fine

oh got it. Thanks. I missed out the !