Hi,
the setting is
"-C <pattern>"
where pattern = C+what you want to find
also, u can use "-i" for case-insensitive search
Example:
vanitygen -o foundoutput.txt -i -C CANNA
hrmm yeah that was a guess of mine but
~/vanitygen$ ./vanitygen -C CANNA
./vanitygen: invalid option -- 'C'
Vanitygen 0.22 (OpenSSL 1.0.2e 3 Dec 2015)
Also tried -X C CANNA to no avail.. will take this over to the vanitygen support thread i guess.