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

You can use is_numeric() with the caveat that it accepts a bit more than one usually wants (e.g. 1e4).