[Bug 229925] [EXP-RUN] Disallow escaping ordinary characters in regex(3)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=229925

--- Comment #27 from commit-hook at freebsd.org ---
A commit references this bug:

Author: kevans
Date: Sun Jun  7 04:32:39 UTC 2020
New revision: 361884
URL: https://svnweb.freebsd.org/changeset/base/361884

Log:
  sed: attempt to learn about hex escapes (e.g. \x27)

  Somewhat predictably, software often wants to use \x27/\x24 among others so
  that they can decline worrying about ugly escaping, if said escaping is even
  possible. Right now, this software is using these and getting the wrong
  results, as we'll interpret those as x27 and x24 respectively. Some examples
  of this, when an exp-run was ran, were science/octopus and misc/vifm.

  Go ahead and process these at all times.  We allow either one or two digits,
  and the tests account for both.  If extra digits are specified, e.g. \x2727,
  then the third and fourth digits are interpreted literally as one might
  expect.

  PR:           229925
  MFC after:    2 weeks

Changes:
  head/usr.bin/sed/compile.c
  head/usr.bin/sed/tests/sed2_test.sh

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