How to parse a command line with regular expressions?

Question

I want to split a command line like string in single string parameters. How look the regular expression for it. The problem are that the parameters can be quoted. For exampl

Answer 1

If you are looking to parse the command and the parameters I use the following (with ^$ matching at line breaks aka multiline):

(?^"[^"]*"|\S*) *(?.*)?

In case you want to use it in your C# code, here it is properly escaped:

try {
    Regex RegexObj = new Regex("(?^\\\"[^\\\"]*\\\"|\\S*) *(?.*)?");

} catch (ArgumentException ex) {
    // Syntax error in the regular expression
}

It will parse the following and know what is the command versus the parameters:

"c:\program files\myapp\app.exe" p1 p2 "p3 with space"
app.exe p1 p2 "p3 with space"
app.exe