+\fB-u\fR, \fB--upper-case-makes-case-sensitive\fR
+using an upper case in the matching string makes the matching
+case-sensitive
+.TP
+\fB-n\fR, \fB--exclamation-negates\fR
+substrings starting with an exclamation mark must be absent for a line
+to match
+.TP