Added support for the NumberBoxParser to allow spaces between input c…

…haracters.

It will now be up to the specified NumberBox.NumberFormatter  to determine if spaces between digits are allowed.

This commit does not change the current behavior of the NumberBox in expression mode.

dev/NumberBox/NumberBoxParser.cpp

@@ -73,8 +73,11 @@ std::vector<MathToken> NumberBoxParser::GetTokens(const wchar_t* input, const wi
 // Attempts to parse a number from the beginning of the given input string. Returns the character size of the matched string.
 std::tuple<double, size_t> NumberBoxParser::GetNextNumber(const std::wstring& input, const winrt::INumberParser& numberParser)
 {
-    // Attempt to parse anything before an operator or space as a number
-    std::wregex regex(L"^-?([^-+/*\\(\\)\\^\\s]+)");
+    // Attempt to parse anything before an operator as a number. In addition, we also don't include trailing spaces here.
+    // Spaces in between symbols will be respected though. For example, an input like "0x1234 5678 + 0x5" passed to regex_search below
+    // will yield the match "0x1234 5678". It is then up to the specified numberParser to determine if spaces between digits
+    // is valid or not.
+    std::wregex regex(L"^-?([^-+/*\\(\\)\\^]*[^-+/*\\(\\)\\^\\s])");
     std::wsmatch match;
     if (std::regex_search(input.cbegin(), input.cend(), match, regex))
     {