PERL syntax highlighter doesn't like 'split' PATTERN of a double-quote

[alexr00]

From @leonid-s-usov in microsoft/vscode#113985

Issue Type: Bug

Thils line of PERL code

my @list = split /"/, $string;

will color all following lines as if withing a string because of the unbalanced quote.

This, however, is a valid PERL code that will split the $string by quotation mark symbols.

VS Code version: Code 1.52.1 (ea3859d4ba2f3e577a159bc91e3074c5d85c0523, 2020-12-16T16:30:02.420Z)
OS version: Darwin x64 19.6.0

System Info

Item	Value
CPUs	Intel(R) Core(TM) i9-9980HK CPU @ 2.40GHz (16 x 2400)
GPU Status	2d_canvas: enabled flash_3d: enabled flash_stage3d: enabled flash_stage3d_baseline: enabled gpu_compositing: enabled metal: disabled_off multiple_raster_threads: enabled_on oop_rasterization: enabled opengl: enabled_on protected_video_decode: unavailable_off rasterization: enabled skia_renderer: disabled_off_ok video_decode: enabled webgl: enabled webgl2: enabled
Load (avg)	1, 2, 2
Memory (System)	32.00GB (1.52GB free)
Process Argv	-psn_0_3085041
Screen Reader	no
VM	0%

Extensions (19)

Extension	Author (truncated)	Version
yacc	car	1.3.1
mikrotik-routeros-script	dev	2018.8.2
xml	Dot	2.5.1
gitlens	eam	11.1.3
go	gol	0.20.1
sftp	lix	1.12.9
lex	lun	0.1.0
autoconf	mae	0.1.0
perl-debug	mor	0.6.3
python	ms-	2020.12.424452561
jupyter	ms-	2020.12.414227025
cmake-tools	ms-	1.5.3
cpptools	ms-	1.1.3
hexeditor	ms-	1.3.0
java	red	0.73.0
angelscript	ren	1.0.1
cmake	twx	0.0.17
vscode-lldb	vad	1.6.1
vscode-java-debug	vsc	0.30.0