问题描述
... $是一种快速提取HTML表格标题属性值的方法b $ b< li>< a href =/ wiki / Proclotitle =Proclo> Proclo< / a>< / li>
< li>< a href =/ wiki / Proclustitle =Proclus> Proclus< / a>< / li>
< li>< a href =/ wiki / Ptolemytitle =托勒密>托勒密< / a>< / li>
< a href =/ wiki / Pythagorastitle =Pythagoras> Pythagoras< / a>< / li>< / ul>< h3> S< / h3>
...
所以它会返回Proclo,Proclus,Ptolemy,Pythagoras,.. ..在每行的字符串中。我正在使用StreamReader读取文件。我使用C#。
谢谢。
C#正则表达式将查找所有标题值:
(?< = \btitle =)[^] *
C#代码如下所示:
<$ p $正则表达式regex = new Regex(@(?< = \btitle =)[^] *);
匹配匹配= regex.Match(输入);
string title = match.Value;
正则表达式使用正向lookbehind 来查找 title
值开始。然后它将所有内容匹配到结尾双引号。
What would be a quick way to extract the value of the title attributes for an HTML table:
...
<li><a href="/wiki/Proclo" title="Proclo">Proclo</a></li>
<li><a href="/wiki/Proclus" title="Proclus">Proclus</a></li>
<li><a href="/wiki/Ptolemy" title="Ptolemy">Ptolemy</a></li>
<li><a href="/wiki/Pythagoras" title="Pythagoras">Pythagoras</a></li></ul><h3>S</h3>
...
so it would return Proclo, Proclus, Ptolemy, Pythagoras,.... in strings for each line. I'm reading the file using a StreamReader. I'm using C#.
Thank you.
This C# regex will find all title values:
(?<=\btitle=")[^"]*
The C# code is like this:
Regex regex = new Regex(@"(?<=\btitle="")[^""]*");
Match match = regex.Match(input);
string title = match.Value;
The regex uses positive lookbehind to find the position where the title
value starts. It then matches everything up to the ending double quote.
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