Regex negative lookahead in c#

问题

I need to match ["this" but not :["this"

I have this code:

        Match match = Regex.Match(result, @"\[""(.*?)""",
            RegexOptions.IgnoreCase);

        while (match.Success)
        {
            MessageBox.Show(match.Groups[1].Value.Trim());
        }

I have tried the pattern @"(?!:)\[""(.*?)""", but it still match :["this". Whats the pattern I need to achieve this?

回答1:

You are looking ahead (rightwards in the string) when you want to be looking behind (leftwards in the string).

Try @"(?<!:)\[""(.*?)""" instead.

回答2:

I used RegexBuddy (I love that app) set to .NET and got the following expression:

@"(?<!:)\[""(.*?)"""

回答3:

You're doing a negative lookahead when you should be doing a negative lookbehind. Try this instead:

Match match = Regex.Match(result, @"(?<!:)\[""(.*?)""", RegexOptions.IgnoreCase);

来源：https://stackoverflow.com/questions/5081504/regex-negative-lookahead-in-c-sharp