解析为数据字符串，但省略引号

Question

I need to use RegEx to run through a string of text but only return that parts that I need. Let's say for example the string is as follows:

1234,Weapon Types,100,Handgun,"This is the text, "and", that is all."""

\\d*,Weapon Types,(\\d*),(\\w+), gets me most of the way, however it is the last part that I am having an issue with. Is there a way for me to capture the rest of the string ie

"This is the text, "and", that is all."""

without picking up the quotes? I've tried negating them, however it just stops the string at the quote.

Please keep in mind that the text for this string is unknown so doing literal matches will not work.

Answer 1

You've given us something very difficult to solve. It's okay that you have nested commas inside your string. Once we come across a double-quote, we can ignore everything until the end quote. This would gooble up commas.

But how will your parser know that the next double-quote isn't ending the string. How does it know that it a nested double-quote?

If I could slightly modify your input string to make it clear what is a nested quote, then parsing is easy...

        var txt = "1234,Weapon Types,100,Handgun,\"This is the text, "and", that is all.\",other stuff";
        var m = Regex.Match(txt, @"^\d*,Weapon Types,(\d*),(\w+),""([^""]+)""");
        MessageBox.Show(m.Groups[3].Value);

But if your input string must have nested quotes like that, then we must come up with some other rule for detecting what is the real end of the string. How about this?

        var txt = "1234,Weapon Types,100,Handgun,\"This is the text, \"and\", that is all.\",other stuff";
        var m = Regex.Match(txt, @"^\d*,Weapon Types,(\d*),(\w+),""(.+)"",");
        MessageBox.Show(m.Groups[3].Value);

The result is...

This is the text, "and", that is all.