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I just need a regular expression that will find values that are not 12 bytes in length. &nbsp;<br />
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For example:<br />
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123 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ---&gt; &nbsp;Error, less than 12<br />
123456789012 &nbsp; &nbsp; &nbsp;----&gt; &nbsp;Valid <br />
1234567890123 &nbsp; -----&gt; Error, greater than 12
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I just need a regular expression that will find values that are not 12 bytes in length.  

For example:

123                           --->  Error, less than 12
123456789012      ---->  Valid 
1234567890123   -----> Error, greater than 12

Regular Expression to find values of a certain lenght

A regular expression ("regex") is a sequence of characters that define a search pattern, mainly for use in pattern matching with strings, or string matching, i.e. "find and replace"-like operations. Regular expression processors are found in several search engines, search and replace dialogs of several word processors and text editors, and in the command lines of text processing utilities, such as sed and AWK. Many programming languages provide regular expression capabilities, some built-in, for example Perl, JavaScript, Ruby, AWK, and Tcl, and others via a standard library, for example .NET languages, Java, Python and C++ (since C++11). Most other languages offer regular expressions via a library.