I think that this is a bug of amxmodx so ^n works from lang file but ^x not works.
I solved this problem, but this method not good.
If in lang file to use ,example, ^^x03 then
in script should to add:
Code:
while( contain (msg, "^^x03" ) != -1 )
replace(msg,99, "^^x03", "^x03" )