Regular expression for Alphanumeric and float

[Rajesh_K_Sharma]

Hi, I need regular expression to validate input string which can not accept [()==<>'~!#$^%*=]+" and regular expression for float which can check if user enters more than four digit after decimal like 1111.12345 . 3333.222 – Valid 3333.1234566 – Invalid Regards Rajesh

rajesh