Your bug report

#20957: 2.21 bug in handling at least one -P regular expression

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 20957@debbugs.gnu.org.

-- 
20957: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=20957
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