Required not work good

Required not work good

i am new here. and i have problem with php.. and i am new in php. i have
input and i don't want to do "Required input" . but its Required.. want i
can do? how can i delete "Required"? i need new code with preg_match but
this Field without Required.
my code is:
if(!preg_match("%^(https?://)([a-z0-9-].?)+(:[0-9]+)?(/.*)?$%i", $temp2)){
$this->class->obj['post_errors'] = 'no_image'; }
and i dont want "Required". thx all helpers. sorry my english.