Heredoc syntax highlighting doesn't recognize numbers

[softwarecreations]

Prerequisites

• Put an X between the brackets on this line if you have done all of the following:
  • Reproduced the problem in Safe Mode: https://flight-manual.atom.io/hacking-atom/sections/debugging/#using-safe-mode
  • Followed all applicable steps in the debugging guide: https://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

Heredoc syntax highlighting doesn't recognize numbers

Steps to Reproduce

Simply paste the code and see.

1. Create script1.bash as follows

#!/bin/bash
echo "Script 1 starting"
echo These files exist: script*.bash
cat >script2.bash << 'SCRIPT2'
#!/bin/bash
echo "Script 2 starting"

cat >script3.bash << SCRIPT3
  echo "Script 3 starting"
  name="Bob"
  echo "Hello $name"
  sayBye() {
    echo "Bye $name"
  }
  byeMsg="$(sayBye)"
  echo "Script 3 ending"
SCRIPT3
echo These files exist: script*.bash
bash script3.bash
echo "Script 2 ending"
SCRIPT2
echo These files exist: script*.bash
bash script2.bash
echo "Script 1 ending"

2. You can run it if you want, to confirm that it works: bash script1.bash

Expected behavior:

1. SCRIPT2 should be treated as a valid heredoc identifier

Actual behavior:

1. Numbers aren't recognized in heredoc identifiers; if you replace SCRIPT2 with SCRIPTTWO then it works.

Reproduces how often:
Every time

Versions

Atom : 1.54.0
Electron: 6.1.12
Chrome : 76.0.3809.146
Node : 12.4.0
apm 2.5.2
npm 6.14.8
node 12.4.0 x64
atom 1.54.0
python 2.7.16
git 2.29.2
Linux Debian Bullseye

Additional Information

N/A