(^$)|(^(0[1-9]|[12][0-9]|3[01])\-(0[1-9]|1[0-2])\-([12][0-9][0-9][0-9])$)

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Was this regex supposed to allow the field to be null as well as validate the date?
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Was this regex supposed to allow the field to be null as well as validate the date?

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Yes. &nbsp;It accepts either an empty string or a valid date.
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Yes.  It accepts either an empty string or a valid date.

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A slightly shorter version &nbsp;: )<br />

<pre><code id="code-7957085">^(?:(?:0[1-9]|[12]\d|3[01])/(?:0[1-9]|1[012])/(?:[12]\d{3}))?$</code></pre>
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A slightly shorter version  : )


^(?:(?:0[1-9]|[12]\d|3[01])/(?:0[1-9]|1[012])/(?:[12]\d{3}))?$

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I have an optional date field. &nbsp;This field needs to be checked for proper date mm/dd/yyyy or if blank allow the null. &nbsp;This feild can have a date in it, and then the user will null the date out if no longer needed. &nbsp;The validator I use always checks for the date and so does not allow the null. &nbsp;<br />
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Thanks for the help
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I have an optional date field.  This field needs to be checked for proper date mm/dd/yyyy or if blank allow the null.  This feild can have a date in it, and then the user will null the date out if no longer needed.  The validator I use always checks for the date and so does not allow the null.  

Thanks for the help

Regulare Expression Validator for date that also allows field to remain blank

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,