[RESOLVED] preg_match problem using regex

rremm2000

Hello all and thanks for reading my question.

I'm trying to make a mini online regex tester for testing my expressions


  $PostReg = trim( $_POST['regex'] );
  $PostTst = trim( $_POST['chars'] );

    IF ( isSet ( $_POST['regex'] ) ){
         IF ( !preg_match( $PostReg, $PostTst, $matches ) ){
              $Out = "No Errors in Posted Text <br />Chars = ". $PostTst . "<br />Within bounds of " . $PostReg;

         }ELSE{
              $Out = "Error in Posted Text match = ". $matches[0];

         }
    }

so I have a form that posts the data for $PostReg, $PostTst
The values are as follows in the actual form fields
$PostReg = /^[0-9]{6}$/

$PostTst = 123556655856525m

it returns that No Errors in Posted Text even it I send an empty field for $PostTst it still says No Errors in Posted Text

Thanks for any help

rremm2000

/[^0-9]{1,12}/

for some reason if I remove the $ off the end of /^[0-9]{6}$/ so it reads /^[0-9]{6}/
it seems to work but says No Errors in Posted Text with 1234 when it should have 6 chars
so I do
/^[0-9]{6,6}/
and 111111111111111111 produces errors finally...lol
but then I use
111
and we are back to no No Errors in Posted Text... i just don't understand

laserlight

It seems like you are confusing yourself with the notion of an "error". /^[0-9]{6}$/ matches a string of 6 digits exactly. '123556655856525m' does not match the regex pattern, thus the first message is printed. This message happens to say "No Errors in Posted Text". Apparently, you regard a failure to match as an error, but then your script is programmed to state the opposite. A quick solution would be to remove the not (!), but that still does not entirely make sense, since you refer to $matches[0] in the other branch.

rremm2000

Ok I rewrote it a little with your input I think its correct now...lol...sorry very confuse by the results I'm getting 😕

<? 

$self=$_SERVER['PHP_SELF']; # Get the Global

if($_POST['pattern']) {
	$pattern=$_POST['pattern'];
	$string=$_POST['string'];
	if (preg_match($pattern,$string))   //preg_match or  eregi
		echo "$pattern pattern matches \"$string\"";
	else
		echo "$pattern pattern does not match \"$string\"";
	}
?>
<html>
<body>
       <h1>Testing Regular Expressions</h1>
       <form action=<? echo "$self"; ?> method=POST>
            String: <input type=text name="string" value="<? echo "$string"; ?>" size=30><br><br>

RegEx Pattern: <input type=text name="pattern" value="<? echo "$pattern"; ?>" size=30><br><br>

<input type=submit value="Test Pattern" name="Submit">
       </form>
</body>
</html>

With preg_match
/^[0-9]{6}$/ pattern matches "123456"
/^[0-9]{6}$/ pattern does not match "12345"
/^[0-9]{6}$/ pattern does not match "1234567"
now that makes sence....

So I tried it with
/^{[0-9]{2,12}$/} pattern matches "12"
/^{[0-9]{2,12}$/} pattern does not match "1"
/^{[0-9]{2,12}$/} pattern matches "123456789012"
/^{[0-9]{2,12}$/} pattern does not match "1234567890123"
All makes sence now :eek:

Thanks for you help