It must be the case that both m{} and qr{} are *both* pattern matches.

No. Read qr's documentation. It does not perform any matching. It simply compiles a pattern.

Isn't a "pattern match" a "regular expression pattern"?

Matching is the action of checking if something is consistent with a definition.

A pattern is a definition of a set of strings.

Binary "=~" binds a *scalar expression* to a *pattern match*.

Indeed it does. These matching operators are m//, s/// and tr///. If you don't use one of these explicitly, you are using m// implicitly. 

$x =~ m//     =>    $x =~ m//
$x =~ s///    =>    $x =~ s///
$x =~ tr///   =>    $x =~ tr///
$x =~ EXPR    ~>    $x =~ do { my $anon = EXPR; m/$anon/ }

[download]

This means that all of the following are functionally equivalent: 

$x =~ m/abc/
$x =~ qr/abc/
$x =~ q/abc/
$x =~ qq/abc/
$x =~ qx/echo abc/
$x =~ 'abc'
$x =~ "abc"
$x =~ sub { "abc" }->()

[download]

What it doesn't mean is that all operators perform regex pattern matching. qr/abc/g makes no more sense than qq/abc/g.

In reply to Re^3: 'g' flag w/'qr' by ikegami
in thread 'g' flag w/'qr' by perl-diddler

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, details, 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, summary, 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.