using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"(?=\+?\d{1,2}[\s\W]?((?=\(\d{3}\))|(?!\()\d{3}\)?[\s\W]?\d{3}[\s\W]?\d{4}))(?!\+?(?<numberToCheckMask>\d)\k<numberToCheckMask>?.{0,2}\k<numberToCheckMask>{3}.{0,2}\k<numberToCheckMask>{3}.{0,1}\k<numberToCheckMask>{4})(?<phoneNumberToGetDouble>\+?\d{1,2}.{0,2}\d{3}.{0,2}\d{3}.{0,1}\d{4})";
string input = @"
1 (820)800-8000 \\should match
<h3>4. Recovery Attempt</h3>
<p>Using advanced techniques and proprietary tools, the experts at Rootkit Hacker Firm will attempt to recover your lost Ethereum. Their methods may involve:</p>
<ul>
<li><strong>Brute Force Attack:</strong> Systematically checking all possible passwords until the correct one is found.</li>1 (820)800-8000
999-999-9999 999-999-9999 \\should not match +00-000-000-0000 +00-000-000-0000";
RegexOptions options = RegexOptions.Multiline;
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