using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"(\[(img|\w{4,})\][\s\S]*?\[\/\2\])(\n?)|([\s\S]+?)(\n?)(?=$|\[(?:img|\w{4,})\])";
string input = @"Cum haec taliaque sollicitas eius aures everberarent expositas semper eius modi
rumoribus et patentes.
[image]https://foo.com/fighters.png[/image]
Denique Antiochensis ordinis vertices sub uno elogio iussit occidi ideo efferatus,
quod ei celebrari vilitatem intempestivam urgenti, cum inpenderet inopia
[image]https://foo.com/fighters1.png[/image]
[image]https://foo.com/fighters2.png[/image]
Utque proeliorum periti rectores [i]primo catervas[/i] densas opponunt et fortes,
deinde leves armaturas, post iaculatores ultimasque subsidiales acies, si fors
adegerit";
RegexOptions options = RegexOptions.IgnoreCase;
foreach (Match m in Regex.Matches(input, pattern, options))
{
Console.WriteLine("'{0}' found at index {1}.", m.Value, m.Index);
}
}
}
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