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is there &nbsp;a simple regex solution that will check for a unique value in a csv column, so: 
 
Name 
--------- 
Dave 
Mark 
John 
 
is OK, but 
 
Name 
--------- 
Dave 
Mark 
Dave 
 
 
errors.... 
Thanks
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is there  a simple regex solution that will check for a unique value in a csv column, so:

Name
---------
Dave
Mark
John

is OK, but

Name
---------
Dave
Mark
Dave


errors....
Thanks

REGEX to check unique value

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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.