Synopsis:
   $rigmask(<address>)

Technical:
   This function is effectively the reverse of igmask(6). It takes a
   nick!user@host as an argument, and returns whichever patterns on the
   ignore(1) list match.

Returns:
   all ignorance list entries that would be triggered by <address>

Examples:
   /ignore *.foo.com ALL
   /ignore fnord!*@* MSGS

   /eval echo $rigmask(user!something@bar.foo.com)
     *.FOO.COM
   
   /eval echo $rigmask(fnord!blah@this.is.a.really.long.host.foo.com)
     *.FOO.COM FNORD!*@*

See Also:
   ignore(1); igmask(6); igtype(6); rigtype(6)