Public bug reported:

In gedit's Perl highlight mode, variables of all kinds ($var, %hash,
@array etc.) are highlighted in dark green. The same usually works for
the last index of an array as well ($#array) but only if the array is
one-dimensional. With multidimensional arrays, the proper syntax is more
complicated: $#{$array[0]} should give the last index of the first
element of an array of arrays. Here gedit however interprets the number
sign (#) as the mark of a comment and highlights the rest of the line in
blue. The expected behavior would be to highlight $#{$array[0]} in dark
green like all other variables. See the attached screenshot.

Description:    Ubuntu 18.04.1 LTS
Release:        18.04

gedit:
  Installed: 3.28.1-1ubuntu1
  Candidate: 3.28.1-1ubuntu1
  Version table:
 *** 3.28.1-1ubuntu1 500
        500 http://mr.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
        100 /var/lib/dpkg/status

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: gedit 3.28.1-1ubuntu1
ProcVersionSignature: Ubuntu 4.15.0-38.41-generic 4.15.18
Uname: Linux 4.15.0-38-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.4
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Tue Oct 30 12:27:38 2018
InstallationDate: Installed on 2017-02-13 (624 days ago)
InstallationMedia: Ubuntu 16.10 "Yakkety Yak" - Release amd64 (20161012.2)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=fi_FI.UTF-8
 SHELL=/bin/bash
SourcePackage: gedit
UpgradeStatus: Upgraded to bionic on 2018-05-31 (151 days ago)

** Affects: gedit (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic

** Attachment added: "Screenshot gedit perl multi-array index.png"
   
https://bugs.launchpad.net/bugs/1800650/+attachment/5207156/+files/Screenshot%20gedit%20perl%20multi-array%20index.png

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https://bugs.launchpad.net/bugs/1800650

Title:
  gedit highlights indexes of multidimensional arrays as comments in
  Perl mode

Status in gedit package in Ubuntu:
  New

Bug description:
  In gedit's Perl highlight mode, variables of all kinds ($var, %hash,
  @array etc.) are highlighted in dark green. The same usually works for
  the last index of an array as well ($#array) but only if the array is
  one-dimensional. With multidimensional arrays, the proper syntax is
  more complicated: $#{$array[0]} should give the last index of the
  first element of an array of arrays. Here gedit however interprets the
  number sign (#) as the mark of a comment and highlights the rest of
  the line in blue. The expected behavior would be to highlight
  $#{$array[0]} in dark green like all other variables. See the attached
  screenshot.

  Description:  Ubuntu 18.04.1 LTS
  Release:      18.04

  gedit:
    Installed: 3.28.1-1ubuntu1
    Candidate: 3.28.1-1ubuntu1
    Version table:
   *** 3.28.1-1ubuntu1 500
          500 http://mr.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
          100 /var/lib/dpkg/status

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: gedit 3.28.1-1ubuntu1
  ProcVersionSignature: Ubuntu 4.15.0-38.41-generic 4.15.18
  Uname: Linux 4.15.0-38-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.4
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Tue Oct 30 12:27:38 2018
  InstallationDate: Installed on 2017-02-13 (624 days ago)
  InstallationMedia: Ubuntu 16.10 "Yakkety Yak" - Release amd64 (20161012.2)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=fi_FI.UTF-8
   SHELL=/bin/bash
  SourcePackage: gedit
  UpgradeStatus: Upgraded to bionic on 2018-05-31 (151 days ago)

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