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 7# legacy escape 8#a\bc & abc abc 9a\ &C EESCAPE 10a\\bc & a\bc a\bc 11\{ bC BADRPT 12a\[b & a[b a[b 13a[b &C EBRACK 14# trailing $ is a peculiar special case for the BRE code 15a$ & a a 16a$ & a$ 17a\$ & a 18a\$ & a$ a$ 19a\\$ & a 20a\\$ & a$ 21a\\$ & a\$ 22a\\$ & a\ a\ 23