Small bugfix in regex parser

src/re.cpp

@@ -380,7 +380,7 @@ namespace lxs {
     {
         size_t i = 0;
         std::shared_ptr<RE> res = parseRE(input, i);
-        if (i < input.length() - 1)
+        if (i < input.length())
             throw SyntaxError("Incorrect regex");
         return res;
     }