lab46:/usr/share/dict$ grep ^.....$ american-english
lab46:/usr/share/dict$ grep ^[jcsJCS] american-english
lab46:/usr/share/dict$ grep ^[j].*[c].*[s]$ american-english
lab46:/usr/share/dict$ grep ^[aeiou].*[aeoiu]$ american-english
lab46:/usr/share/dict$ grep [jcsJCS][aeiou].*[est]$ american-english
lab46:/usr/share/dict$ grep ^[^jcs].*$ american-english
lab46:/usr/share/dict$ grep ^[^th]...*$ american-english
lab46:/usr/share/dict$ grep ^..[e]$ american-english
lab46:/usr/share/dict$ grep ^.*[b][o][b].*[^b]$ american-english
lab46:/usr/share/dict$ grep ^[b][l][u][e].*$ american-english
lab46:/usr/share/dict$ grep ^[^aeiyou]*$ american-english
lab46:/usr/share/dict$ grep ^[^aeiouy].[abcd].*[aeiouy]$ american-english