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Use pattern:<br />
^[A-Z]{5}\d{5}$
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This should do it:<br />
<br />

<pre><code class="code-1 nolinks" id="code-20-36912766-1"><span>[A-Z]{5}[0-9]{5}</span>
</code></pre>
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<div>
In code I think it goes something like this... <br />
<br />
If Regex.Match(str, &quot;^[A-Z]{5}\\d{5}$&quot;).Succes<wbr />s Then<br />
&nbsp; &nbsp; &nbsp;strErr = &quot;Error!&quot;<br />
End If
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Oops, that would be:<br />
<br />
If Regex.Match(str, &quot;^[A-Z]{5}\\d{5}$&quot;).Succes<wbr />s Then<br />
&nbsp; &nbsp; &nbsp;strMsg = &quot;Great!&quot;<br />
End If
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<div>
My solution was missing the leading ^ to anchor the search at the start of the string. &nbsp;@TerryAtOpus got it right.<br />
<br />
You only need the &quot;$&quot; at the end of the pattern if you do not want any characters to be allowed after the five digits. &nbsp;(That was not in your problem description.)<br />
<br />

<pre><code class="code-1 nolinks" id="code-20-36912795-1"><span>^[A-Z]{5}[0-9]{5}</span>
</code></pre>
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I can use this, correct? I am not sure what this does &nbsp;regexoptions.complied? <br />
private reg_str as new regex(&quot;^[A-Z]{5}[0-9]{5}$&quot;<wbr />, regexoptions.complied) <br />
<br />
if reg_str.ismatch(mystring) then<br />
...<br />
end if 
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<div>
^[A-Z]{5}\\d{5}$&quot;) &nbsp;I don't understand this<br />
^[A-Z]{5}[0-9]{5} &nbsp;, I understand this<br />
<br />
sorry, I am new to regex
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\d means a digit. The \ is backslashed because of the way .NET handles strings.
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(so \\d and [0-9] are the same thing)
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<div>
As for the question about regexoptions, you might like to use something like this if you want to ignore case:<br />
<br />
Dim options As RegexOptions = RegexOptions.IgnoreCase<br />
If Regex.Match(str, &quot;^[A-Z]{5}\\d{5}$&quot;).Succes<wbr />s Then<br />
&nbsp; &nbsp; &nbsp;strMsg = &quot;Great!&quot;<br />
End If
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<div>
Sorry, should be:<br />
<br />
Dim options As RegexOptions = RegexOptions.IgnoreCase<br />
If Regex.Match(str, &quot;^[A-Z]{5}\\d{5}$&quot;, RegexOptions).Success Then<br />
&nbsp; &nbsp; &nbsp;strMsg = &quot;Great!&quot;<br />
End If
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<div class="content wysiwyg-content">
I want to check to see if my first five string is alpha and the next five is numberic using Regex. <br />
ABCDE12345
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I want to check to see if my first five string is alpha and the next five is numberic using Regex. 
ABCDE12345

If alph to numberic in regex

Visual Basic .NET (VB.NET) is an object-oriented programming language implemented on the .NET framework, but also supported on other platforms such as Mono and Silverlight. Microsoft launched VB.NET as the successor to the Visual Basic language. Though it is similar in syntax to  Visual Basic pre-2002, it is not the same technology,