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分享string test = "[A1]\n[A2]\n[A3]\n[A4]";
Regex reg = new Regex(@"(?s)\n(?=(.+))");
MatchCollection mc = reg.Matches(test);
foreach (Match m in mc)
{
richTextBox2.Text += m.Groups[1].Value + "\n----------------------\n";
}s = "[A1]\n[A2]\n[A3]\n[A4]";
ArrayList l = new ArrayList();
while (s.IndexOf("\n") == 0)
{
l.Add(s.SubString(s.IndexOf("\n") + 1));
s = s.SubString(s.IndexOf("\n") + 1);
}
foreach (String s in l)
{
Console.WriteLine(s);
}