Inconsistent escape highlighting

[eviljoe]

Prerequisites

• Put an X between the brackets on this line if you have done all of the following:
  • Reproduced the problem in Safe Mode: http://flight-manual.atom.io/hacking-atom/sections/debugging/#using-safe-mode
  • Followed all applicable steps in the debugging guide: http://flight-manual.atom.io/hacking-atom/sections/debugging/
  • Checked the FAQs on the message board for common solutions: https://discuss.atom.io/c/faq
  • Checked that your issue isn't already filed: https://github.com/issues?utf8=✓&q=is%3Aissue+user%3Aatom
  • Checked that there is not already an Atom package that provides the described functionality: https://atom.io/packages

Description

The syntax highlighting for escapes is inconsistent. It works when in strings, but does not work when in here strings or here documents.

Steps to Reproduce

See the following screenshot:

• The plain string escape has syntax highlighting
• The here string escape does not have syntax highlighting
• The here document escape does not have syntax highlighting

Expected behavior: All three of the escapes should have syntax highlighting

Actual behavior: The here string and here document escapes do not have syntax highlighting.

Reproduces how often: 100%

Versions

Atom

Atom    : 1.22.1
Electron: 1.6.15
Chrome  : 56.0.2924.87
Node    : 7.4.0

apm

apm  1.18.8
npm  3.10.10
node 6.9.5 x64
python 2.7.12
git 2.7.4

OS
Linux Mint 18.3 Sylvia

Additional Information

Any additional information, configuration or data that might be necessary to reproduce the issue.