java python oracle推断字符串是否为数字的函数

java

	public boolean isNumeric(String str){ 
		 Pattern pattern = Pattern.compile("^-?[0-9]+\.?[0-9]*"); 
		   Matcher isNum = pattern.matcher(str);
		   if( !isNum.matches() ){
		       return false; 
		   } 
		   return true; 
		}

python

def isNum(value):
        try:
                int(value) + 1
        except:
                return False
        else:
                return True

oracle

create or replace function func_is_number( sx in varchar) return int is
 x number;
  begin
x:=to_number(sx);




return 1;

exception
  when others then
return 0;
 end;