Matches userhost with pattern and sets rc to 0 if there is no match and rc to 1 if there is a match. USERHOST *must* be a real host like nick!user@hostname and not a pattern. PATTERN may hold special charecters like "*" and "?" such as ni*!use?@ho?tna*.
Example:
options results
"MATCHUSERHOST Joe!Joeshmoe@ppp100.net.il *!*@*.net.il"
"ECHO" rc