Hi LanX,

Thanks for your comments, I'll think about whether I can provide a TL;DR version - my thought was that impatient users could just copy-n-paste my code :-)

IIRC there is a hard limit for the length of a regex-string

I'm not sure, I'll have to look into it, but I do know this works :-)

my $word_regex = do {
    open my $wfh, '<:utf8', '/usr/share/dict/words' or die $!;
    chomp( my @words = <$wfh> );
    close $wfh;
    my $re = join '|',
        map {quotemeta}
        sort { length $b <=> length $a or $a cmp $b }
        @words;
    qr/$re/i };
print length($word_regex), "\n";

__END__

964836

[download]

Thanks,
-- Hauke D

In reply to Re^2: [RFC] Building Regex Alternations Dynamically by haukex
in thread Building Regex Alternations Dynamically by haukex

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.