Regex: Fix handling of control escapes inside character classes

src/regex_impl.cc

@@ -278,9 +278,6 @@ private:
         }
 
         // CharacterEscape
-        struct { Codepoint name; Codepoint value; } control_escapes[] = {
-            { 'f', '\f' }, { 'n', '\n' }, { 'r', '\r' }, { 't', '\t' }, { 'v', '\v' }
-        };
         for (auto& control : control_escapes)
         {
             if (control.name == cp)
@@ -337,10 +334,15 @@ private:
                 }
                 else // its just an escaped character
                 {
-                    
+                    cp = *m_pos++;
-                    if (++m_pos == m_regex.end())
+                    for (auto& control : control_escapes)
+                    {
+                        if (control.name == cp)
+                        {
+                            cp = control.value;
                             break;
-                    cp = *m_pos;
+                        }
+                    }
                 }
             }
 
@@ -487,8 +489,10 @@ private:
         StringView additional_chars;
         bool neg;
     };
-
     static const CharacterClassEscape character_class_escapes[8];
+
+    struct ControlEscape { Codepoint name; Codepoint value; };
+    static const ControlEscape control_escapes[5];
 };
 
 // For some reason Gcc fails to link if this is constexpr
@@ -499,6 +503,11 @@ const RegexParser::CharacterClassEscape RegexParser::character_class_escapes[8]
     { 'h', nullptr, " \t", false },
 };
 
+
+const RegexParser::ControlEscape RegexParser::control_escapes[5] = {
+    { 'f', '\f' }, { 'n', '\n' }, { 'r', '\r' }, { 't', '\t' }, { 'v', '\v' }
+};
+
 struct RegexCompiler
 {
     RegexCompiler(const ParsedRegex& parsed_regex, MatchDirection direction)
@@ -1062,6 +1071,12 @@ auto test_regex = UnitTest{[]{
         kak_assert(vm.exec("abc"));
     }
 
+    {
+        TestVM<> vm{R"([^:\n]+)"};
+        kak_assert(not vm.exec("\nbc"));
+        kak_assert(vm.exec("abc"));
+    }
+
     {
         TestVM<> vm{R"((?:foo)+)"};
         kak_assert(vm.exec("foofoofoo"));