Another place where the effect of my $x; and my ($x); differs is in matching regular expressions. Assigning a match in scalar context just records whether the match was successful, like this

perl -e 'my $x = "abcdefg" =~ /(cd)/; print "$x\n";'

[download]

prints

1

whereas matching in list context assigns the captures in the match

perl -e 'my ($x) = "abcdefg" =~ /(cd)/; print "$x\n";'

[download]

prints

cd

Normally, or rather probably, you would be making more than one capture in the regular expression so you would do something like

my($this, $that) = $string =~ /abc(def).+?(pq)$/;

[download]

Cheers,

JohnGG

In reply to Re: my $x or my ($x) by johngg
in thread my $x or my ($x) by tamaguchi

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.