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Sorry that it's VB, but should help you enough on the way (probably takes you a few more minutes to get it to C#): 
 

<pre><code class="code-10 nolinks" id="code-20-41795928-1">Imports System.Text.RegularExpressions

Public Class Form1

 Dim names() As String = {&quot;A. Buddhi&quot;, &quot;L. Natan&quot;, &quot;Kumar. S&quot;, &quot;Jim&quot;, &quot;123&quot;, &quot;AA. BDDF&quot;, &quot;AA BB&quot;, &quot;1. Cekke&quot;, &quot;AAAAs. 3&quot;}

 Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
 For Each single_name In names
 TextBox1.AppendText(single_name &amp; &quot; = &quot; &amp; checkname(single_name) &amp; vbCrLf)
 Next
 End Sub

 Function checkname(name As String)
 Dim regex As Regex = New Regex(&quot;^[A-Z].\s[A-Z][a-z]+&quot;) 'A. Buddhi = True, L.Natan = True
 Dim regex2 As Regex = New Regex(&quot;^[A-Z][a-z]+.\s[A-Z]$&quot;) 'Kumar. S = True
 Dim regex3 As Regex = New Regex(&quot;^[A-Z][a-z]+$&quot;) 'Jim = True
 Dim match As Match = regex.Match(name)
 If match.Success Then
 Console.WriteLine(match.Value)
 checkname = True
 Exit Function
 End If
 match = regex2.Match(name)
 If match.Success Then
 Console.WriteLine(match.Value)
 checkname = True
 Exit Function
 End If
 match = regex3.Match(name)
 If match.Success Then
 Console.WriteLine(match.Value)
 checkname = True
 Exit Function
 End If
 checkname = False
 End Function

End Class
</code></pre>
 
In case you want it case INsensitive, I need to modify it slightly.
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Hello There, 
 
Please be kind enough to give a valid regex for Initials. 
 
E.g :- A.P &nbsp;or J.K There are no spaces in between the dot and the letter K. It should be valid for any initial. 
 
Kind Regards, 
Indunil Sanjeewa
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<div>
<div class="content wysiwyg-content">
Hello There, 
 
Please be kind enough to provide me with a code to best validate a name field with or without initials. 
E.g - The name field should be represented like the following; 
 
A. Buddhi 
L. Natan 
Kumar. S or 
Jim 
Bob 
Kate 
 
All the above tests should pass without showing an error message. 
 
If the name ends with a dot or starts with a dot it should give a message as *Required 
any other data should be prevented on key input. 
 
Kind Regards, 
Indunil Sanjeeewa
</div>
</div>

Hello There,

Please be kind enough to provide me with a code to best validate a name field with or without initials.
E.g - The name field should be represented like the following;

A. Buddhi 
L. Natan 
Kumar. S or
Jim
Bob
Kate

All the above tests should pass without showing an error message.

If the name ends with a dot or starts with a dot it should give a message as *Required
any other data should be prevented on key input.

Kind Regards,
Indunil Sanjeeewa

Name Field Validation

C# is an object-oriented programming language created in conjunction with Microsoft’s .NET framework. Compilation is usually done into the Microsoft Intermediate Language (MSIL), which is then JIT-compiled to native code (and cached) during execution in the Common Language Runtime (CLR).

The .NET Framework is not specific to any one programming language; rather, it includes a library of functions that allows developers to rapidly build applications. Several supported languages include C#, VB.NET, C++ or ASP.NET.