Node Name
string nodeName = "$OS";
concat()
concat("a","b","c") => "abc"
example
s@name = concat(chs("prefix"), "_", itoa(@primnum));
padzero
sprintf("%04d", 15)
>> 0015
re_replace
s@tmp_name = re_replace("A","B", Imput_string_A);
>> Imput_string_B
Mattern Match
int a = match("*abc*", "aaabccccddd");
>> 1