sed -i -E "s/ёж$/ёжик/g" *ru*; sed -i -E "s/еж([аиу])$/ёжик\1/g" *ru*
grep -E "(ёж|еж[аиу])$" *ru*
AAAB1nicLY9bjsMgDEUNNjhp2syGg8TCQR0f6M+R7ftIqE2apGZNrHkTb6XJ+cTtfuJ2PXE7nrjZ/M5uU6ZUpsrkgV6YytTf6rOwLlRulUQiEWnbyFQ5lhA0IEJWqVISOXw9M6UNB2FJmL/EZMcy5oUlGIIhKH1KTIkVbgsVn/OnUfoa8ZjXiO8eTAeTB/rJdA79rT4K6wLPAsdIJIyWhUyVYwnhCshN9qLqIvEOX38zfTYchOWD+Y/YvWMZ88ISDMEQlD4lpsQKt4WKj2dR+g9qCctS