PHP regex - valid float number

Question

I want user only input 0-9 and only once \".\"

 patt = /[^0-9(.{1})]/

 1.2222 -> true
 1.2.2  -> false (only once \'.\')

help me , t

Answer 1

Why not use http://php.net/manual/en/function.is-float.php ? But anyhow, the RegEx would be ^[\d]+(|\.[\d]+)$ have fun!