简单的正则表达式

一个字符

ID=[txtID.TEXT] AND NAME=[txtName.Text] AND Status='Y'

把中括号里面的提取出来。

[txtID.TEXT]
[txtName.Text]

C# code

        string s = "ID=[txtID.TEXT] AND NAME=[txtName.Text] AND Status='Y'";
        MatchCollection matches = Regex.Matches(s, @"(?<=\[)[^]]+(?=\])");
        foreach (Match match in matches)
            Response.Write(match.Value + "<br/>");

输出：
txtID.TEXT
txtName.Text