Regexp for a double
c++-cli, regex
Solution
There's nothing wrong with the regex per se, it's your escaping that's at fault. You need to double escape the `\` character since that's also a C++ string escape character.
Additionaly there is an edge case where this regex would think that `1.` is a valid floating pointer number. So you might be better off with `/^[0-9]+(\\.[0-9]+)?$` which eliminates that possibility.
Problem
I have got this regexp `"^[0-9]+\.?[0-9]*$")` to match a double number or an integer number in visual C++ but it doesn't seem to work. Any ideas? This is how I am applying the code: ``` if (System::Text::RegularExpressions::Regex::IsMatch(e0, "^[0-9]+\.?[0-9]*$")){ e0_val = System::Convert::ToDouble(e0); } ```