eregi thingy...

[xposed]

Hi all,
I'm trying to make my form to check if the username people write when they register only uses ordinary letters, numbers, "_" and "-" ....how am I to do this???

I tried to read about regular expressions....but I'm too stupid to understand how to do yet...

[stolzyboy]

$pos1 = strrpos($mystring, "");
$pos2 = strrpos($mystring, "-");
if ($pos1 === false && $pos2 === false) // note: three equal signs
{
echo "none of those characters found";
}
else
{
echo "you can't use the '' and '-' characters";
}

[Randomizer]

I once had this problem too...

if (!ereg("^[abcdefghijklnmopqrstuvwxyz0123456789-_]*$", $username))
{
echo "<P>Error: Your username is invalid only use characters a-z(No Capitals), 0-9, underscores(_) and dashes(-)";
}