using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"<div>\s*\n\s*.*?<p class=.*?>(.*?)<\/p>\s*\n\s*.*?\s*\n\s*(?=(\<a class=\""a\""\>))";
string substitution = @"";
string input = @"<div>
<p class=""match""> this sentence should match </p>
some text
<a class=""a""> some text </a>
</div>
<div>
<p class=""match""> this sentence shouldnt match</p>
some text
<a class =""b""> some text </a>
</div>
<div>
<p class=""match""> this sentence should match </p>
some text
<a class=""a""> some text </a>
</div>";
Regex regex = new Regex(pattern);
string result = regex.Replace(input, substitution);
}
}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for C#, please visit: https://msdn.microsoft.com/en-us/library/system.text.regularexpressions.regex(v=vs.110).aspx