$substr(<substring> <search string>)

The <substring> argument is a dword which is unlike most other functions.

These functions search for <substring> in <search string> and return the index to it. $rsubstr() is identical to $substr(), except it searches from the end to the beginning.

They can be used to search for specific things in output from a server, or as an alternative to $match(*substring* searchstring).

-1 if <substring> not found in <search string>
index to <substring> in <search string> if found