Can someone help me to correct my code in python programming? I need to validate the user's input using regex.

importreasr classValidations: defis_int(number,param): number=r.match("[0-9]",param) defint_validation(param): is_int=r.match("[0-9]",param) ifparam!=is_int: print("NotanInteger") returnFalse  else: print() returnTrue x=int_validation(input("Enterx:")) y=int_validation(input("Entery:")) z=int_validation(input("Enterz:")) max=None ifx>yandx>z: max=x elify>z: max=y else: max=z print("Thebiggestofthethreenumbersis%s"%max) print("----------------------------------------------")