This bug was fixed in the package grep - 3.7-0ubuntu1
--------------- grep (3.7-0ubuntu1) impish; urgency=medium
* New upstream version 3.7 to fix FTBFS (LP: #1940999) * Use built-in regex instead of the one from glibc, to address failure of test-regex with version 3.7.
-- Dan Bungert <email address hidden> Mon, 30 Aug 2021 16:41:22 -0600
This bug was fixed in the package grep - 3.7-0ubuntu1
---------------
grep (3.7-0ubuntu1) impish; urgency=medium
* New upstream version 3.7 to fix FTBFS (LP: #1940999)
* Use built-in regex instead of the one from glibc, to address failure of
test-regex with version 3.7.
-- Dan Bungert <email address hidden> Mon, 30 Aug 2021 16:41:22 -0600