Restrict Charcters

[whiteboikyle]

i think the function was something along the lines of eregi() or something.. but i need help restricting /\:*?"'<>|.,!@#$%^()[]{};`~=+

Pretty much make it only Numbers and Letters

 

 

[DarkWater]

ctype_alnum().

[discomatt]

The easy way with regex is

 

# Allows letters, numbers, underscores
if (  preg_match( '[^\w]', $subject )  )
    exit( 'Bad characters found' );

 

or

 

# Allows letters, numbers
if (  preg_match( '[^A-z0-9]', $subject )  )
    exit( 'Bad characters found' );

[whiteboikyle]

okay well i do

//Defines All The Users Inputs
	$myusername=$_POST['myusername'];
	$mypassword=$_POST['mypassword'];	
	$mypassword2=$_POST['mypassword2'];
	$email=$_POST['email'];
	$passwordcount=$_POST['mypassword'];

	# Allows letters, numbers
	if(!preg_match('[^A-z0-9]', $myusername))
	{
	session_register(bad_char);
	$_SESSION['bad_char'] = "<center><font color='red' size='1'>Invalid Charcter; Only Letters Or Numbers Can Be Used!</font></center>";
	header("location:register.php");
	}

 

but it for some reason checks $mypassword to.. If i put !@#%!@#$ or anything in $mypassword it results to session_register(bad_char) but i only want it for $myusername

 

[DarkWater]

Because you did the regex wrong.  The guy who posted it did it right.  Why can't people copy and paste anymore? if(preg_match('[^A-z0-9]', $myusername))

 

The ^ in the [ ] means 'not'.

[whiteboikyle]

ooh i didn't know the ^ meant not sorry xD

 

but now it wont show at all using

 

	if(preg_match('[^A-z0-9]', $myusername))
	{
	session_register(bad_char);
	$_SESSION['bad_char'] = "<center><font color='red' size='1'>Invalid Charcter; Only Letters Or Numbers Can Be Used!</font></center>";
	header("location:register.php");
	}

 

xD never used preg_match before.. sorry i am so complicated

 

[whiteboikyle]

bump please help

[whiteboikyle]

Does it have to be an Array?

 

This is my code

		//Defines All The Users Inputs
	$myusername=$_POST['myusername'];
	$myusername2=$_POST['myusername'];
	$mypassword=$_POST['mypassword'];	
	$mypassword2=$_POST['mypassword2'];
	$email=$_POST['email'];
	$passwordcount=$_POST['mypassword'];

	# Allows letters, numbers
	if(preg_match('/^[a-zA-Z0-9]+$/i', $myusername2)) 
	{
	die("True");
	session_register(bad_char);
	$_SESSION['bad_char'] = "<center><font color='red' size='1'>Invalid Charcter; Only Letters Or Numbers Can Be Used!</font></center>";
	header("location:register.php");
	} else {
	die("False");
	}

[effigy]

if (!preg_match('/^[a-z\d]+$/i', $myusername2)) {
  echo 'Invalid';
} 

 

Also see extract for your variable assignments.