Code:

while $read(test\database.txt, w, *The.Sentinel*, $calc($readn +1)) {
  echo -s Wildcard dupe: $ifmatch
}

See /help $read for information on the 4th parameter.

You can also use the /filter command, to filter matching lines into a file or a window. Example:
Code:

/filter -ff test\database.txt output.txt *The.Sentinel*


(this one copies matching lines into output.txt)

See /help /filter for more info.