[RESOLVED] is there a way to

[jansky]

to all guru

i have a validation here which will be very strict in entering a postal code

when first character is 0 or not numeric not allowed
when it is lsser than 6 not valid
when first four characte is not number not valid
when last 2 characters is not character(a-z) not valid <-- i am stuck here

i have this in my form
<type="text" name="zipcode" size='7' maxlength='7">

now when click on submit
this is my script

if (empty($_POST['zipcode']))
$zipcode=$str_error_zip;
	else
	{
			$zip=$_POST['zipcode'];
			if ($zip{0}==0)
				$zipcode=$str_error_zip_not_valid;
			else
			{
				 if ((strlen($zip)==7)  || (strlen($zip)==6) )
			 	{
							$zip1=substr($zip,0,4);
							$zip2=substr($zip,4,7);

						if (!is_numeric($zip1))$zipcode=$str_error_zip_digit_valid;
						 if (is_numeric($zip2))$zipcode ="2nd digit is not valid<br>"; // now i am stuck here 
		 	}else{
			$zipcode=$str_error_zip_not_valid;
			}
		}	


}

		 	

how can i detect if the last 2 character is just (a-z) no space allowed and not number

[Jasp182]

You need to use a regular expression to validate this. There are many ways to do this. I'm still very new to this topic, but I believe you can achieve it with either of the following:

if ( eregi ( "[a-zA-Z]{2}" , $zip3 ) ) { ...

or:

if ( eregi ( "[:alpha:]{2}" , $zip3 ) ) { ...

I'm pretty sure I read somewhere that preg_match is not only faster but is more of a standard php implementation of regular expressions, but I'm sure some of the more experienced users can clarify this.

[jansky]

Thanks i have this one

 if ((!eregi("^[a-zA-Z]",$zip2{0})) || (!eregi("^[a-zA-Z]",$zip2{1})) )