java python oracle判断字符串是否为数字的函数

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;
}

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

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;