[Rd] Typo in help-file for 'regexp'

[Pfaff, Bernhard Dr.]

Dear R-maintainer,

in the help-file for 'regexp' I detected the following word redundancy:


Is:
===
For basic and extended regular expressions the the collation order is
taken from the OS's ...
                                           ^^^^^^^
Should read:
============
For basic and extended regular expressions the collation order is taken
from the OS's ...


Best,
Bernhard
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