package main import ( "slices" "testing" ) var reTests = []struct { re string str string result []matchIndex }{ {"a", "abc", []matchIndex{{0, 1}}}, {"a", "bca", []matchIndex{{2, 3}}}, {"l", "ggllgg", []matchIndex{{2, 3}, {3, 4}}}, {"(b|c)", "abdceb", []matchIndex{{1, 2}, {3, 4}, {5, 6}}}, {"a+", "brerereraaaaabbbbb", []matchIndex{{8, 13}}}, {"ab+", "qweqweqweaqweqweabbbbbr", []matchIndex{{16, 22}}}, {"(b|c|A)", "ooaoobocA", []matchIndex{{5, 6}, {7, 8}, {8, 9}}}, {"ab*", "a", []matchIndex{{0, 1}}}, {"ab*", "abb", []matchIndex{{0, 3}}}, {"a*b", "aaab", []matchIndex{{0, 4}}}, {"a*b", "qwqw", []matchIndex{}}, {"(abc)*", "abcabcabc", []matchIndex{{0, 9}, {9, 9}}}, {"((abc)|(def))*", "abcdef", []matchIndex{{0, 6}, {6, 6}}}, {"(abc)*|(def)*", "abcdef", []matchIndex{{0, 3}, {3, 6}, {6, 6}}}, {"b*a*a", "bba", []matchIndex{{0, 3}}}, {"(ab)+", "abcabddd", []matchIndex{{0, 2}, {3, 5}}}, {"a(b(c|d)*)*", "abccbd", []matchIndex{{0, 6}}}, {"a(b|c)*d+", "abccdd", []matchIndex{{0, 6}}}, {"a*", "", []matchIndex{{0, 0}}}, {"a|b", "c", []matchIndex{}}, {"(a|b)*c", "aabbc", []matchIndex{{0, 5}}}, {"a(b|b)", "ab", []matchIndex{{0, 2}}}, {"a*", "aaaaaaaa", []matchIndex{{0, 8}, {8, 8}}}, {"ab?", "ab", []matchIndex{{0, 2}}}, {"a?b", "ab", []matchIndex{{0, 2}}}, {"a?", "", []matchIndex{{0, 0}}}, {"a?b?c", "a", []matchIndex{}}, {"a?b?c?", "ab", []matchIndex{{0, 2}, {2, 2}}}, {"a?b?c?", "ac", []matchIndex{{0, 2}, {2, 2}}}, {"a?b?c", "abc", []matchIndex{{0, 3}}}, {"a?b?c", "acb", []matchIndex{{0, 2}}}, {"[abc]", "defadefbdefce", []matchIndex{{3, 4}, {7, 8}, {11, 12}}}, {"[ab]c", "ab", []matchIndex{}}, {"g[ab]c", "gac", []matchIndex{{0, 3}}}, {"g[ab]c", "gbc", []matchIndex{{0, 3}}}, {"g[ab]c", "gc", []matchIndex{}}, {"g[ab]c", "gfc", []matchIndex{}}, {"[ab]*", "aabbbabaababab", []matchIndex{{0, 14}, {14, 14}}}, {"[ab]+", "aabbbablaababab", []matchIndex{{0, 7}, {8, 15}}}, {"[Ff]r[Uu]it", "fruit", []matchIndex{{0, 5}}}, {"[Ff]r[Uu]it", "FrUit", []matchIndex{{0, 5}}}, {"[Ff]r[Uu|]it", "Fr|it", []matchIndex{{0, 5}}}, {"[Ff]r([Uu]|[pP])it", "Frpit", []matchIndex{{0, 5}}}, {"[Ff]r[Uu]|[pP]it", "Frpit", []matchIndex{{2, 5}}}, {"[a-zA-Z]+", "Hello, how is it going?", []matchIndex{{0, 5}, {7, 10}, {11, 13}, {14, 16}, {17, 22}}}, {".+", "Hello, how is it going?", []matchIndex{{0, 23}}}, {"a.", "a ", []matchIndex{{0, 2}}}, {"a.b", "a/b", []matchIndex{{0, 3}}}, {".", "a ", []matchIndex{{0, 1}, {1, 2}}}, {"a.", "a ", []matchIndex{{0, 2}}}, {".+b", "abc", []matchIndex{{0, 2}}}, {`\d`, "1a0a3s'''34343s", []matchIndex{{0, 1}, {2, 3}, {4, 5}, {9, 10}, {10, 11}, {11, 12}, {12, 13}, {13, 14}}}, {`\\`, `a\b\c\qwe\`, []matchIndex{{1, 2}, {3, 4}, {5, 6}, {9, 10}}}, {`\W`, `"Hello", he said. How are you doing?`, []matchIndex{{0, 1}, {6, 7}, {7, 8}, {8, 9}, {11, 12}, {16, 17}, {17, 18}, {21, 22}, {25, 26}, {29, 30}, {35, 36}}}, {`\w`, ";';';';';'qwe12", []matchIndex{{10, 11}, {11, 12}, {12, 13}, {13, 14}, {14, 15}}}, {`\s`, "a b c d", []matchIndex{{1, 2}, {3, 4}, {5, 6}, {6, 7}}}, {`\<`, "", []matchIndex{{0, 1}, {6, 7}}}, {`$.+$`, "Not (paranthesized), (so) is (this) not", []matchIndex{{4, 35}}}, {"[^abc]+", "qarbtopsaplpclkpasdmb prejip0r,p", []matchIndex{{0, 1}, {2, 3}, {4, 8}, {9, 12}, {13, 16}, {17, 20}, {21, 32}}}, {"[^a]+", "qqqaq", []matchIndex{{0, 3}, {4, 5}}}, {"[^0-9]+", "a1b2c3dd", []matchIndex{{0, 1}, {2, 3}, {4, 5}, {6, 8}}}, {"[^abc]+", "ababababbababaccacacacaca", []matchIndex{}}, {`$[^)]+$`, "Not (paranthesized), (so) is (this) not", []matchIndex{{4, 19}, {21, 25}, {29, 35}}}, {"^ab", "ab bab", []matchIndex{{0, 2}}}, {"^aaaa^", "aaaaaaaa", []matchIndex{}}, {"^([bB][Gg])", "bG", []matchIndex{{0, 2}}}, {"b$", "ba", []matchIndex{}}, {"(boy|girl)$", "girlf", []matchIndex{}}, {`\bint\b`, "print int integer", []matchIndex{{6, 9}}}, {`int(\b|a)`, "inta", []matchIndex{{0, 4}}}, {`\b\d+\b`, "511 a3 43", []matchIndex{{0, 3}, {7, 9}}}, } func TestFindAllMatches(t *testing.T) { for _, test := range reTests { t.Run(test.re+" "+test.str, func(t *testing.T) { re_postfix := shuntingYard(test.re) startState := thompson(re_postfix) matchIndices := findAllMatches(startState, test.str) if !slices.Equal(test.result, matchIndices) { t.Errorf("Wanted %v Got %v\n", test.result, matchIndices) } }) } }