Yes, there is a difference.
\() is like a factored out reference operator before every thing inside the parenthesis, so \($foo, @bar, %baz, &frah) is (\$foo, \@bar, \%baz, \&frah), except if there's only one aggregate data type inside it. In that case it gets flattened and the backslash is then applied to each element of that list, as you say. This means that
(\($foo, $foo, ..., $foo[$#foo]), \@bar)
((\$foo, \$foo, ..., \$foo[$#foo]), \@bar)
\((@foo, @bar), @baz)
(\(@foo, @bar), \@baz)
((\@foo, \@bar)), \@baz)
Update: I just realized that my second example is rather useless as the end result is the same as if there was no inner parenthesis. But the intermediate step perhaps still has a pedagogical value.
(I don't know if this recursive behaviour is how it's actually performed under the hood, but it works this way none the less.)
Are you posting in the right place? Check out Where do I post X? to know for sure.
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
Want more info? How to link or
or How to display code and escape characters
are good places to start.