Auto-detection of compressed files with option -z; new "negate" operators ! and ^ for file type matching with -t^TYPE (do not match files of type TYPE), filename extension matching with -O^EXT (do not match filenames with suffix EXT), and file signature magic byte matching with -M^MAGIC (do not match files that start with matching MAGIC regex patterns); bug fix for possible undesired memory allocation exceptions raised when searching files with long lines when options -X and -W are used.