1272343Sngie# subtleties of matching 2272343Sngieabc & xabcy abc 3272343Sngiea\(b\)?c\1d b acd 4272343SngieaBc i Abc Abc 5272343Sngiea[Bc]*d i abBCcd abBCcd 6272343Sngie0[[:upper:]]1 &i 0a1 0a1 7272343Sngie0[[:lower:]]1 &i 0A1 0A1 8272343Sngiea[^b]c &i abc 9272343Sngiea[^b]c &i aBc 10272343Sngiea[^b]c &i adc adc 11272343Sngie[a]b[c] - abc abc 12272343Sngie[a]b[a] - aba aba 13272343Sngie[abc]b[abc] - abc abc 14272343Sngie[abc]b[abd] - abd abd 15272343Sngiea(b?c)+d - accd accd 16272343Sngie(wee|week)(knights|night) - weeknights weeknights 17272343Sngie(we|wee|week|frob)(knights|night|day) - weeknights weeknights 18272343Sngiea[bc]d - xyzaaabcaababdacd abd 19272343Sngiea[ab]c - aaabc abc 20272343Sngieabc s abc abc 21272343Sngiea* & b @b 22