What did you do, golf mine? :)

I was unaware at that property of ^, very nice... in fact, I'm not ever sure why that works. Time for me to hit perlman:perlop.

Update:

Ok, its like this: ^ is XOR. That means the bit returns true if and only if one of the 2 bits is true: 

lc $new # lowercase the replacement
^ $1    # XOR with $1 - will increase the values by
        # the corresponding ascii value of each character
        # of $1
^ lc $1 # XOR with lc $1 - basically, it will subract the
        # ascii values of lowercase $1 - if the values were
        # lowercase to begin with, the resulting sum is 0,
        # otherwise, the increase is enough to uppercase
        # the corresponding character

[download]
In short - an incredibly concise way of doing it. ++!

In reply to Re: Re: Case-preserving substitutions by jryan
in thread Case-preserving substitutions by wasii

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.