This should get you close to what you want..
>perl -e "my $x = qq['foo',123,'bar\\'cuz', 'comma,comma',,'void'];
map { print qq[<$_;\n]; } $x=~m/((?:'[^']*'|[^'\s,]+|))(?:[$|,\s]|$
+)/g;"
<'foo';
<123;
<'cuz';
<;
<'comma,comma';
<;
<'void';
<;
There is an extra empty item returned. No easy way to avoid that, that I can think of.
'bar\'cuz' is an invalid text string, in this context, so only 'cuz' is returned.
Note the use of non-capturing parens "(?:" - quite useful in this context, so each iteration returns only a single capture, because the first paren IS a capturing paren.
"As you get older three things happen. The first is your memory goes, and I can't remember the other two... "
- Sir Norman Wisdom
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