Re: [Nano-devel] [PATCH] syntax: perl: don't color the character after a variable name

[Benno Schulenberg]

>>> "[$@%&*]\$?(\^[][A-Z^_?\]|[0-9]+|[A-Za-z_][0-9A-Za-z_]*|[][`~!@#$%&*-=+;:'",.\\|/?()<>])|\{(\^_?[0-9A-Za-z]+|[0-9]+|[A-Za-z_][0-9A-Za-z_]*)\})"

In the braces fragment, why is an underscore only allowed directly after
a leading caret?  Because with this rule, variables like

    %{^CAPTURE_ALL}
    ${^RE_DEBUG_FLAGS}

are not colored.  So I think the braces fragment can be simplified to:

    \{(\^?[A-Za-z_][0-9A-Za-z_]*|[0-9]+)\}

Do you agree?

Where does it say, by the way, that Perl variable names cannot start with
a digit (unless they are all digits)?  It seems reasonable, but the first
paragraph of the linked document [1] seems to say that something like
$12foo is fine.  (Emacs seems to think it is okay, but vim colors only
the $12 part.)

  [1] https://perldoc.perl.org/perlvar.html

Benno

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