[Bug 1940996]

[Vincent-srcware]

What about attachment 10674 ("This test case silently returns the wrong
answer"), with the pattern "^(11+)\\1+$|^1?$" and the string
"1111111111111"?

Should it be regarded as part of Bug#17356 or another bug? This case
seems quite different from Bug#10844 and Bug#17356. Unless the intent is
to group all the bugs about regexp involving backreferences giving a
wrong answer[*] (in which case Bug#10844 and Bug#17356 should be
regarded as duplicates to each other), I think that this should be a new
bug.

[*] as opposed to a crash like in this bug 11053.

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https://bugs.launchpad.net/bugs/1940996

Title:
  test failure - test-regex

Status in grep:
  Fix Released
Status in grep package in Ubuntu:
  New

Bug description:
  'test-regex' fails when building grep against glibc 2.34.
  Per commentary from grep upstream at https://debbugs.gnu.org/cgi/bugreport.cgi?bug=50069, 
  the test failure can be attributed to skew between the glibc built-in regex and the one that is found in the grep source code.

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