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dfCmpNum()
Compress a string containing numbers
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Syntax:

     dfCmpNum( <cSource> ) --> cTarget

Parameters:

     <cSource>  Source string.

Returns:

     cTarget Compressed string.

Description:

     Compress a string that contains numeric characters, returning a string
     whose lenght is half the lenght of the source string.

Example:

     ? dfCmpNum( "123456" ) // returns ".w+"

See also:

     dfChrInc()