use YAPE::Regex::Explain;
$search = "\x8C\x95";
$encoding = q{ # Shift-JIS encoding
[\x00-\x7F] # ASCII/JIS-Roman
| [\x81-\x9F\xE0-\xFC][\x40-\x7E\x80-\xFC] # JIS X 0208:1997
| [\xA0-\xDF] # Half-width katakana
};
$regex = qr/^ (?:$encoding)*? $search/osx;
print  YAPE::Regex::Explain->new($regex)->explain;