1# metacharacters, backslashes 2a.c & abc abc 3a[bc]d & abd abd 4a\*c & a*c a*c 5a\\b & a\b a\b 6a\\\*b & a\*b a\*b 7a\bc & abc abc 8a\ &C EESCAPE 9a\\bc & a\bc a\bc 10\{ bC BADRPT 11a\[b & a[b a[b 12a[b &C EBRACK 13# trailing $ is a peculiar special case for the BRE code 14a$ & a a 15a$ & a$ 16a\$ & a 17a\$ & a$ a$ 18a\\$ & a 19a\\$ & a$ 20a\\$ & a\$ 21a\\$ & a\ a\ 22