If it's just the flags, you can remove them yourself. 

my %on_flags;
my %off_flags = map { $_ => 1 } split //, 'xism';
my $pattern = "$compiled";

if ($pattern =~ /^\(\?([a-z]+)(?:-([a-z])+)?:(.*)\)\z/s) {
   (my $on_flags, my $off_flags, $pattern) = ($1, $2||'');

   %on_flags  = map { $_ => 1 } split //, $on_flagfs;
   delete @off_flags{keys %on_flags};

   %off_flags = map { $_ => 1 } split //, $off_flags;
   delete @on_flags{keys %off_flags};
}

...generate JavaScript code here...

[download]

Note: Doesn't handle other features of Perl regexps not present in JavaScript. There's a regexp parser module on CPAN (whose name escapes me) that would be more useful to you if you want to handle more.

Note: Since it expects a compiled pattern, it doesn't handle $compiled = '(?i:foo)bar\)';

In reply to Re^5: Can qr be un-compiled? by ikegami
in thread Can qr be un-compiled? by cosmicperl

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.