Beefy Boxes and Bandwidth Generously Provided by pair Networks Frank
Clear questions and runnable code
get the best and fastest answer
 
PerlMonks  

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??
Hi all, I have the following little script demonstrating a case (case 1 in the output below), which I can't explain to myself. So I hoped, someone can explain it to me or give the right hints.
#!/usr/bin/perl -CO use strict; use warnings; use Encode; use utf8; my $a = ''; print "UTF8-Flag: ", utf8::is_utf8($a) ? "Yes" : "No"; print " matches word: ", $a =~ /\w/ ? "Yes\n" : "No\n"; my $b = encode("ISO-8859-1", $a); print "UTF8-Flag: ", utf8::is_utf8($b) ? "Yes" : "No"; print " matches word: ", $b =~ /\w/ ? "Yes\n" : "No\n"; use locale; $a = ''; print "UTF8-Flag: ", utf8::is_utf8($a) ? "Yes" : "No"; print " matches word: ", $a =~ /\w/ ? "Yes\n" : "No\n"; $b = encode("ISO-8859-1", $a); print "UTF8-Flag: ", utf8::is_utf8($b) ? "Yes" : "No"; print " matches word: ", $b =~ /\w/ ? "Yes" : "No"; print "\n";
The output on a linux box with locale de_DE.UTF-8 and perl source code encoded in UTF-8 is:
UTF8-Flag: Yes matches word: Yes UTF8-Flag: No matches word: No UTF8-Flag: Yes matches word: No UTF8-Flag: No matches word: No
It's the very first case I can't explain to me. Why is an unicode-flagged '' matched against words when locale is not set explicitly?

Thanks in advance
Andreas


In reply to Regex Matching Unicode and Regex Classes by McA

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!
  • 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
  • Outside of code tags, you may need to use entities for some characters:
            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?
    Username:
    Password:

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

    How do I use this? | Other CB clients
    Other Users?
    Others having an uproarious good time at the Monastery: (16)
    As of 2014-04-16 17:05 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      April first is:







      Results (433 votes), past polls