Reg Expression Routine, Issue With Dash Character

[son]

I check some input fields before letting user upload data. Now I found that the dash character prevents user uploading data although I allowed it in my reg expressions. I would appreciate if you had a look at:

if (!eregi ('^[[:alnum:]\ \:\-\?\&]{2,200}$', stripslashes(trim($_POST['heading'])))) {	$h = FALSE;	$errors['heading'] = '\'Heading\' not in correct format or too long';	} else	{		$h = escape_data($_POST['heading']);	$heading_echo = $h;	}

I also tried without the dash escaped? Where am I going wrong?Son

[son]

Moved now the dash character to the end and works as:if (!eregi ('^[[:alnum:]\ \:\?\&\-]{2,200}$', stripslashes(trim($_POST['heading'])))) {Does anyone know what is the difference? Although it is working now, do not really get why it did not work before...Son