Beefy Boxes and Bandwidth Generously Provided by pair Networks
Just another Perl shrine

comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
... in this case explicit \n matches where dot with s mod doesn't.

That's because  \n$ requires a match with newline, but  .$ allows the leftmost position of a match with dot (with /s) to be before the newline. Dot will match newline in the presence of  $ if it is the only match available:

c:\@Work\Perl\monks>perl -wMstrict -le "use Data::Dump qw(pp); ;; for my $s (qq{yz}, qq{yz\n}, qq{\n}) { $s =~ m{ (.) $ }xms; printf qq{in %s matched %s \n}, pp($s), pp($1); } " in "yz" matched "z" in "yz\n" matched "z" in "\n" matched "\n"
(The  /m modifier makes no difference in these example strings.)

The thing to remember about regular expressions is that there are a lot of things to remember about regular expressions. If you have a chance to reduce the amount of stuff to remember, even if only by a little, take it. That's why I advise (per TheDamian's regex PBPs) using  \A \z \Z for all your start- and end-of-string anchoring needs, and using  ^ $ only for embedded newline matching.

... inconsistency ...

For me, it's not so much inconsistency as mind-boggling complexity. And again, I come back to the point that if you can reduce the complexity of what you're dealing with even a little, you're ahead of the game.

Give a man a fish:  <%-{-{-{-<

In reply to Re^3: How to match last character of string, even if it happens to be a newline? by AnomalousMonk
in thread How to match last character of string, even if it happens to be a newline? by Allasso

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.
  • Log In?

    What's my password?
    Create A New User
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others examining the Monastery: (4)
    As of 2019-06-19 00:41 GMT
    Find Nodes?
      Voting Booth?
      Is there a future for codeless software?

      Results (83 votes). Check out past polls.

      • (Sep 10, 2018 at 22:53 UTC) Welcome new users!