截取字符串问题

[Bodil]

假设有段代码，如下

<div class="basic" style="float:left;"  id="list1a">
			<a>There is one obvious advantage:</a>
			<div>
				<p>
					You've seen it coming!<br/>
					Buy now and get nothing for free!<br/>
					Well, at least no free beer. Perhaps a bear,<br/>
					if you can afford it.
				</p>
			</div>
			<a>Now that you've got...</a>
			<div>
				<p>
					your bear, you have to admit it!<br/>
					No, we aren't selling bears.
				</p>
			</div>
			<a>Rent one bear, ...</a>
			<div>
				<p>
					get two for three beer.
				</p>
				<p>
					<a>And now, for something completely different.</a>
					<a>And now, for something completely different.</a>
					<a>And now, for something completely different.</a>
					<a>And now, for something completely different.</a>
					<a>And now, for something completely different.</a>
					And now, for something completely different.<br/>
					And now, for something completely different.<br/>
					And now, for something completely different.<br/>
					Period.
				</p>
			</div>
		</div>

我要截取id为list1a的DIV标签下的字符串，条件是每个<a></a>截取一次，每个<div></div>截取一次，我要存进数据库的，a标签取出来的放入一个字段，div取出来的放入一个字段，a标签所在字段和div标签所在字段是同一行的
如何取？
还有，如果div标签中有a标签怎么办，我要div里的全部内容

[root_]

你要取的<a> </a>和<div> </div>是交替出现的吗？如果符合这个规律，那么div标签中有a标签是没有关系的

MatchCollection mc = Regex.Matches(str, @"(<a[^>]*>[\s\S]*?</a>)\s*(<div[^>]*>[\s\S]*?</div>)", RegexOptions.IgnoreCase);
foreach (Match m in mc)
{
    richTextBox1.Text += m.Groups[1].Value + "\n";
    richTextBox1.Text += m.Groups[2].Value + "\n";
    richTextBox1.Text += "---------------------------\n";
}

[root_]

如果id为list1a的DIV标签事先并没有取得，那么可以先获取id为list1a的DIV标签，然后再应用上面的方法取得a标签和div标签

Match mStr = Regex.Match(str, @"<div[^>]*?id=""list1a""[^>]*>(((?<o>)<div[^>]*>|(?<-o>)</div>|(?:(?!</?div)[\s\S]))*)(?(o)(?!))</div>", RegexOptions.IgnoreCase);
if (mStr.Success)
{
    MatchCollection mc = Regex.Matches(mStr.Value, @"(<a[^>]*>[\s\S]*?</a>)\s*(<div[^>]*>[\s\S]*?</div>)", RegexOptions.IgnoreCase);
    foreach (Match m in mc)
    {
        richTextBox1.Text += m.Groups[1].Value + "\n";
        richTextBox1.Text += m.Groups[2].Value + "\n";
        richTextBox1.Text += "---------------------------\n";
    }
}

[jiang_jiajia10]

[Quote=引用 2 楼 root_ 的回复:]
如果id为list1a的DIV标签事先并没有取得，那么可以先获取id为list1a的DIV标签，然后再应用上面的方法取得a标签和div标签


C# codeMatch mStr = Regex.Match(str, @"<div[^>]*?id=""list1a""[^>]*>(((?<o>)<div[^>]*>|(?<-o>)</div>|(?:(?!</?div)[\s\S]))*)(?(o)(?!))</div>", RegexOptions.IgnoreCase);
if (mStr.Success)
{
MatchCollection mc = Regex.Matches(mStr.Value, @"(<a[^>]*>[\s\S]*?</a>)\s*(<div[^>]…
[/Quote]
正则王道

[Bodil]

[Quote=引用楼主 xxc3303 的帖子:]
假设有段代码，如下

HTML code<div class="basic" style="float:left;" id="list1a">
<a>There is one obvious advantage:</a>
<div>
<p>
You've seen it coming!<br/>
Buy now and get nothing for free!<br/>
Well, at least no free beer. Perhaps a bear,<br/>
if you can afford it…
[/Quote]
多谢了，实现了，但是能不能再帮我改下，我只要<a></a>里面的内容,不要把它们带上,<div></div>里的也一样

[root_]

[Quote=引用 4 楼 xxc3303 的回复:]
多谢了，实现了，但是能不能再帮我改下，我只要 <a> </a>里面的内容,不要把它们带上, <div…
[/Quote]

那就换一下捕获的位置就行了

Match mStr = Regex.Match(str, @"<div[^>]*?id=""list1a""[^>]*>(((?<o>)<div[^>]*>|(?<-o>)</div>|(?:(?!</?div)[\s\S]))*)(?(o)(?!))</div>", RegexOptions.IgnoreCase);
if (mStr.Success)
{
    MatchCollection mc = Regex.Matches(mStr.Value, @"<a[^>]*>([\s\S]*?)</a>\s*<div[^>]*>([\s\S]*?)</div>", RegexOptions.IgnoreCase);
    foreach (Match m in mc)
    {
        richTextBox1.Text += m.Groups[1].Value + "\n";
        richTextBox1.Text += m.Groups[2].Value + "\n";
        richTextBox1.Text += "---------------------------\n";
    }
}

[net_xiaojian]

来学习。

[Bodil]

[Quote=引用 5 楼 root_ 的回复:]
引用 4 楼 xxc3303 的回复:
多谢了，实现了，但是能不能再帮我改下，我只要 <a> </a>里面的内容,不要把它们带上, <div…


那就换一下捕获的位置就行了

C# code
Match mStr = Regex.Match(str, @"<div[^>]*?id=""list1a""[^>]*>(((?<o>)<div[^>]*>|(?<-o>)</div>|(?:(?!</?div)[\s\S]))*)(?(o)(?!))</div>", RegexOptions.IgnoreCase);
if (mStr.Success)
{
MatchCollection mc = Regex.Matches(mStr.Value, @…
[/Quote]
万分感谢，高手好厉害啊，分都给你了，想问下阁下正则用了多久了，这么快就弄出来了。。。

[root_]

[Quote=引用 7 楼 xxc3303 的回复:]
万分感谢，高手好厉害啊，分都给你了，想问下阁下正则用了多久了，这么快就弄出来了。。。
[/Quote]

呵呵，正则入门很容易，但要做到信手拈来，那就要多做练习了，我玩正则已经有一年了