Add test to check additional onepass regexps

Author: bboreham

src/regexp/onepass_test.go

@@ -142,6 +142,7 @@ var onePassTests = []struct {
 	{`^(?:(a)|(?:a*))$`, false},
 	{`^(?:(?:(?:.(?:$))?))$`, true},
 	{`^abcd$`, true},
+	{`^abcd`, true},
 	{`^(?:(?:a{0,})*?)$`, false},
 	{`^(?:(?:a+)*)$`, true},
 	{`^(?:(?:a|(?:aa)))$`, true},
@@ -154,6 +155,7 @@ var onePassTests = []struct {
 	{`^(?:(?:aa)|a)$`, true},
 	{`^[a-c]*`, false},
 	{`^...$`, true},
+	{`^...`, true},
 	{`^(?:a|(?:aa))$`, true},
 	{`^a((b))c$`, true},
 	{`^a.[l-nA-Cg-j]?e$`, true},