4) 20%D Wed 10:12 PM a elp st id-892&token 93a6b4f8-47b6-4011-9589-eOd942aad236 The following presents a system of pattern matching which can be used to recognize patterns of characters az Most characters are literal. For example, "axbco matches "asbo but no other strings Dot, will match any single character Therefore "a.b" will match 'aab, "abb, "alb", a&b. L-] Square brackets will match any character that is listed within the t) Therefore "alghjb will match "agb ahb 'aib but nothing else. ? means 'the previous item is optionar Therefore ab?c will match ac" and abc" but nothing else means "zero or more of the previous item* Therefore "ab*c will match "ac, "abe, "abbe, abbbe... + means "one or more of the previous item Therefore "abre" will match "abc, "abbe, "abbbc, "abbbbe