c# - Regex to extract attribute value

Question

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.

Answer 1

This C# regex will find all title values:

(?<=title=")[^"]*

The C# code is like this:

Regex regex = new Regex(@"(?<=title="")[^""]*");
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.