Added lazy quantifier tests

regex/re_test.go

@@ -488,7 +488,25 @@ var reTests = []struct {
 	{`[b-e]`, nil, `f`, []Group{}},
 
 	{`*?`, nil, `-`, nil},
-	{`a*?`, nil, `-`, nil}, // non-greedy operators are not supported
+	{`a.+c`, nil, `abcabc`, []Group{{0, 6}}},
+	// Lazy quantifier tests
+	{`a.+?c`, nil, `abcabc`, []Group{{0, 3}, {3, 6}}},
+	{`ab*?bc`, []ReFlag{RE_CASE_INSENSITIVE}, `ABBBBC`, []Group{{0, 6}}},
+	{`ab+?bc`, []ReFlag{RE_CASE_INSENSITIVE}, `ABBC`, []Group{{0, 4}}},
+	{`ab??bc`, []ReFlag{RE_CASE_INSENSITIVE}, `ABBC`, []Group{{0, 4}}},
+	{`ab??bc`, []ReFlag{RE_CASE_INSENSITIVE}, `ABC`, []Group{{0, 3}}},
+	{`ab??bc`, []ReFlag{RE_CASE_INSENSITIVE}, `ABBBBC`, []Group{}},
+	{`ab??c`, []ReFlag{RE_CASE_INSENSITIVE}, `ABC`, []Group{{0, 3}}},
+	{`a.*?c`, []ReFlag{RE_CASE_INSENSITIVE}, `AXYZC`, []Group{{0, 5}}},
+	{`a.+?c`, []ReFlag{RE_CASE_INSENSITIVE}, `ABCABC`, []Group{{0, 3}, {3, 6}}},
+	{`a.*?c`, []ReFlag{RE_CASE_INSENSITIVE}, `ABCABC`, []Group{{0, 3}, {3, 6}}},
+	{`.*?\S *:`, nil, `xx:`, []Group{{0, 3}}},
+	{`a[ ]*? (\d+).*`, nil, `a   10`, []Group{{0, 6}}},
+	{`a[ ]*? (\d+).*`, nil, `a    10`, []Group{{0, 7}}},
+	{`"(?:\\"|[^"])*?"`, nil, `"\""`, []Group{{0, 4}}},
+	{`^.*?$`, nil, "one\ntwo\nthree", []Group{}},
+	{`a[^>]*?b`, nil, `a>b`, []Group{}},
+	{`^a*?$`, nil, `foo`, []Group{}},
 
 	// Numeric range tests - this is a feature that I added, and doesn't exist
 	// in any other mainstream regex engine
@@ -719,6 +737,18 @@ var groupTests = []struct {
 	// {`(a|ab|c|bcd)*(d*)`, nil, `ababcd`, []Match{[]Group{{0, 6}, {3, 6}, {6, 6}}, []Group{{6, 6}, {6, 6}, {6, 6}}}},
 	// // Bug - this should give {0,3},{0,3},{0,0},{0,3},{3,3} but it gives {0,3},{0,2},{0,1},{1,2},{2,3}
 	// //	{`((a*)(b|abc))(c*)`, nil, `abc`, []Match{[]Group{{0, 3}, {0, 3}, {0, 0}, {0, 3}, {3, 3}}}},
+
+	// Lazy quantifier tests
+	{`a(?:b|c|d)+?(.)`, nil, `ace`, []Match{[]Group{{0, 3}, {2, 3}}}},
+	{`a(?:b|(c|e){1,2}?|d)+?(.)`, nil, `ace`, []Match{[]Group{{0, 3}, {1, 2}, {2, 3}}}},
+	{`(?<!-):(.*?)(?<!-):`, nil, `a:bc-:de:f`, []Match{[]Group{{1, 9}, {2, 8}}}},
+	{`(?<!\\):(.*?)(?<!\\):`, nil, `a:bc\:de:f`, []Match{[]Group{{1, 9}, {2, 8}}}},
+	{`(?<!\?)'(.*?)(?<!\?)'`, nil, `a'bc?'de'f`, []Match{[]Group{{1, 9}, {2, 8}}}},
+	{`.*?x\s*\z(.*)`, []ReFlag{RE_MULTILINE, RE_SINGLE_LINE}, "xx\nx\n", []Match{[]Group{{0, 5}, {5, 5}}}},
+	{`.*?x\s*\z(.*)`, []ReFlag{RE_MULTILINE}, "xx\nx\n", []Match{[]Group{{3, 5}, {5, 5}}}},
+	{`^([ab]*?)(?=(b)?)c`, nil, `abc`, []Match{[]Group{{0, 3}, {0, 2}, {-1, -1}}}},
+	{`^([ab]*?)(?!(b))c`, nil, `abc`, []Match{[]Group{{0, 3}, {0, 2}, {-1, -1}}}},
+	{`^([ab]*?)(?<!(a))c`, nil, `abc`, []Match{[]Group{{0, 3}, {0, 2}, {-1, -1}}}},
 }
 
 func TestFind(t *testing.T) {