They long since lifted the 'only one lvalue ref' limitation. This is 5.10.1:

$s = 'abcdefghijklmnopqrstuvwxyz';;

@r = map \substr( $s, $_*4, 2), 0..6;;

$$_ = uc $$_ for @r;;

say $s;;
ABcdEFghIJklMNopQRstUVwxYZ

say $];;
5.010001

[download]

It does have its limitations though. (Unsurprisingly) The lvalue refs do not adjust to accommodate replacements that alter the length of the string:

$$_ = $_ for @r;;

say $s;;
REF(REF(REF(REF(REF(REF(REF(0x3e82050)3e821e8)3e82260)3e820e0)11c458)3
+e820c8)335dc0)cdEFghIJklMNopQRstUVwxYZ

[download]
With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

In reply to Re^3: Is there a module for object-oriented substring handling/substitution? (2 substrs) by BrowserUk
in thread Is there a module for object-oriented substring handling/substitution? by smls

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.