rings = {'B1', 'B2', 'B12', 'A12', 'A1', 'A2'} ;
 sorted = vl_alphanum(strings) ;
</pre><p>
produces the sorted array {'A1', 'A2', 'A12', 'B1', B2',
'B12'}. By contrast, SORT() produces the array {'A1', 'A12',
'A2', 'B1', B12', 'B2'} (note the position of the elements
'A12', 'B12').
</p></dd></dl><p>
References:
[1] Dave Koelle, 'The Alphanum Algorithm',
http://www.davekoelle.com/alphanum.html
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