[Bug 1769941] Re: grep fails to match an empty line using perl regexp if it's the last line in a file

[Andrew McCarthy]

I can't identify when it was fixed, but can confirm this is not
happening any more in grep 3.1-2build1 in Ubuntu 18.04.

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https://bugs.launchpad.net/bugs/1769941

Title:
  grep fails to match an empty line using perl regexp if it's the last
  line in a file

Status in grep package in Ubuntu:
  New

Bug description:
  1) The release of Ubuntu you are using, via 'lsb_release -rd' or System -> About Ubuntu
  Description:	Ubuntu 16.04.4 LTS
  Release:	16.04

  2) The version of the package you are using, via 'apt-cache policy pkgname' or by checking in Software Center
  grep:
    Installed: 2.25-1~16.04.1
    Candidate: 2.25-1~16.04.1
    Version table:
   *** 2.25-1~16.04.1 500
          500 http://ru.archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
          100 /var/lib/dpkg/status
       2.24-1 500
          500 http://ru.archive.ubuntu.com/ubuntu xenial/main amd64 Packages

  3) What you expected to happen
  (echo 123; echo; ) | grep -P '^$'
  $ # output contains one empty line
  $ (echo 123; echo;) | grep -P '^$'

  $

  4) What happened instead
  $ # output contains no line
  $ (echo 123; echo;) | grep -P '^$'
  $

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: grep 2.25-1~16.04.1
  ProcVersionSignature: Ubuntu 4.13.0-38.43~16.04.1-generic 4.13.16
  Uname: Linux 4.13.0-38-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.16
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Tue May  8 18:49:45 2018
  InstallationDate: Installed on 2018-02-13 (83 days ago)
  InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
  SourcePackage: grep
  UpgradeStatus: No upgrade log present (probably fresh install)

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