I prefer to match each field separately. 
#!perl
use strict;
use warnings;

*FILE_EXPECTED_RESULT = *DATA;

while (<FILE_EXPECTED_RESULT>) {
    next if /^\s*$/;
    chomp;
    print "\n", $_ , "\n";
    my (@match) = /
                ( \w* \. (?: c|cpp|h ) )                # File Namew
                \s*
                ( None  | \d{1,2}\.\d\d%\sof\s\d{1,3} ) # Percent 2
                \s*
                ( None  | \d{1,2}\.\d\d%\sof\s\d{1,3} ) # Percent 3
            /xms;

    print "title : " .    $match[0] . "\n";
    print "percent2 : " . $match[1] . "\n";
    print "percent3 : " . $match[2] . "\n";

}
close(FILE_EXPECTED_RESULT);
__DATA__
Title               Percent2   Percent3
test1.cpp     0.00% of 21     0.00% of 16
test2.c     None   16.53% of 484
test3.h         0.00% of 138    None

[download]
Bill

In reply to Re: how to extract string by possible groupings? by BillKSmith
in thread how to extract string by possible groupings? by adrive

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.