Update the POSIX Extended section of the Regular Expression Wikipedia page

PiperOrigin-RevId: 479667644
Change-Id: I4ab03bd5f0520f8586667de8bd1b9443f241337a
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Abseil Team 2022-10-07 14:20:15 -07:00 committed by Copybara-Service
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@ -487,7 +487,7 @@ When built with Bazel and using Abseil, googletest uses the
systems (Linux, Cygwin, Mac), googletest uses the
[POSIX extended regular expression](http://www.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap09.html#tag_09_04)
syntax. To learn about POSIX syntax, you may want to read this
[Wikipedia entry](http://en.wikipedia.org/wiki/Regular_expression#POSIX_Extended_Regular_Expressions).
[Wikipedia entry](http://en.wikipedia.org/wiki/Regular_expression#POSIX_extended).
On Windows, googletest uses its own simple regular expression implementation. It
lacks many features. For example, we don't support union (`"x|y"`), grouping