using System;
using System.Text.RegularExpressions;
using System.Linq;
public class Test
{
public static void Main()
{
var str = "jkasdlue as 12&sdaj__3982[source=saj_/29]sj*2&7^;'asj[source=-js/.2]_jsld+=[source=283]";
var res = Regex.Matches(str, @"\[source=([A-Za-z0-9-_ \\/.:]+)\]").Cast<Match>().Select(match => match.Groups[1].Value).ToList();
Console.WriteLine(String.Join("\n", res));
}
}
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