Hash mark (#) treated as comment start in Perl even when it isn't

[GoogleCodeExporter]

Consider a Perl statement like this:

    $last_index = $#array;

The hash mark here is treated like the start of an in-line comment; the text 
"#array;" appears in comment style. In fact, this is normal Perl syntax for the 
last valid index of an array.

I'm using whatever version is currently installed at StackOverflow.

Original issue reported on code.google.com by [email protected] on 30 Jun 2011 at 9:15

[GoogleCodeExporter]

Same here with css id selector, like:
@codeStart #id { attribute: value; } @codeEnd
The whole line ^ treated as comment.

Live example: http://jsfiddle.net/bN3gr/

Original comment by [email protected] on 1 Aug 2011 at 8:45

[GoogleCodeExporter]

Also  caused by using hashes as delimiter in quote like operators

       qq#test#;

And also by regex operators

      s#a#b#;

both of these are normal alternative delimiters

Original comment by [email protected] on 4 May 2013 at 12:52