Your bug report

#15410: [:alnum:] is not [:alpha:] AND [:digit:]... [:alnum:] is [:alpha:] OR [:digit:]

which was filed against the grep package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 15410@debbugs.gnu.org.

-- 
15410: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=15410
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