using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"@\[(.*?)\]\(contact:(\d+)\)";
string input = @"This is a string which has a @[User Full Name](contact:1) data inside.
This is a string which has a @[User Full Name](contact:1) data inside. and it can also contain many other users data like @[Second Username](contact:2) and @[Third username](contact:3) and so many others....";
foreach (Match m in Regex.Matches(input, pattern))
{
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