If you set $::RD_TRACE, it would tell you where it stopped working for the first time, by not matching the terminals or rule or subrules.

The following code works as per what you want. 

$grammar = q(
       file: section(s) 
       section: header assign(s?)
       header: '[' /\w+/ ']'
       assign: pair comment(?)
       pair:   /\w+/ '=' /\w+/
       comment: /[\;\#]/ /\w+/
};

[download]
It gives you the output like: 
header: [ Section1 ]
pair: key1 = value1
comment: # Comment
assign: 1 ARRAY(0x1d5e758)
pair: key2 = value2
comment: ; Comment
assign: 1 ARRAY(0x2014078)
pair: key3 = value3
assign: 1 ARRAY(0x1d5e818)
section: 1 ARRAY(0x1d5e74c)
header: [ Section2 ]
pair: key4 = value4
assign: 1 ARRAY(0x20140cc)
pair: key5 = value5
assign: 1 ARRAY(0x1d5e830)
section: 1 ARRAY(0x2014090)
file: ARRAY(0x2014084)

[download]
The removal of the '$' sign at the end of the 'assign' terms does the trick. I also seperated the comments from the key value pair.

artist

In reply to Re: Problem with P::RD grammar by artist
in thread Problem with P::RD grammar by TStanley

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.