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;  beginx:=to_number(sx);return 1;exception  when others thenreturn 0; end;