Was having fun with variations on johngg's use of a lookahead (novel, at least to me; ++). Then took one version of OP's spec -- the 10 chars AFTER each "47" -- as my target and came up with this (awkward and ugly?, besmirched with globals; non-PBP) approach: 
#!/usr/bin/perl
use 5.016;
use warnings;

# D:\_Perl_\PMonks\1053693.pl

my $str = q/471234xx3798375754712345678901234547zyxabcdefghjkl/;

my ($arr, @arr1, $arr1, $i);

my @arr = split /47/, $str;

for $arr ( @arr ) {
    @arr1 = split //, $arr;
    for $i (0 .. 9) { 
        no warnings 'uninitialized';
        $arr1 .= $arr1[$i];
        use warnings;
    }
    say "$arr1\n";
    undef $arr1;
}



=head output:

1234xx3798

1234567890

zyxabcdefg

=cut

[download]

Would welcome suggestions for using this approach more elegantly (for the spec '10 char after "47"').

If I've misconstrued your question or the logic needed to answer it, I offer my apologies to all those electrons which were inconvenienced by the creation of this post.

In reply to Re: print number of characters after specific character by ww
in thread print number of characters after specific character by amparida

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.