Ok im no great Regex Person.
But i found a script that validates internet addresses which was actually in the phpbb code.
Now there are a few things that i havent actually found out what it means.
ok
first is
symbol.
Im not too sure what it does but it does it to this bit
#([\t\r\n ])
and at the end we have this
(/[^ \"\n\r\t<]*)?)#i
Im thinking the i means first #.
I know the \n\t\r. But its mainly just that symbol.