using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"\s(?=\w*[0-9])(?=\w*[A-Z])([A-Z\d]{11}|[A-Z\d]{7})\s";
string input = @"From: Creedence Colossal <tmpwchange@gmail.com> To: ""tmpwchange@gmail.com"" N4EYN5DW9CT <tmpwchange@gmail.com> Subject: +14242767352 5/18/2021 9:22:23 PM Return-Path: <tmpwchange@gmail.com> Received: from [192.168.1.34] (047-232-149-032.res.spectrum.com. [47.232.149.32]) by smtp.gmail.com with ESMTPSA id x6sm4564717pfj.24.2021.05.18.21.22.51 for 9GS4C81 <tmpwchange@gmail.com> (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Tue, 18 May 2021 21:22:52 -0700 (PDT) Date: Tue, 18 May 2021 21:22:23 -0700 Message-Id: <U8F57JFLRDU4.QQL5G9PGZESZ2@DESKTOP-6PJ7AGK> MIME-Version: 1.0 Content-Type: text/plain; charset=""utf-8"" 9GS4C84 -- This 8001355 email ESMTPSA has been checked for viruses by Avast antivirus software.";
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