"I'm working on a grammar to parse SQL"

Any particular reason? Is this just a learning exercise, or are you doing it because you actually need to parse some SQL? If the latter, stop doing what you're doing, and use SQL::Statement instead.

If you're just trying to learn PRD, then here's a hint... alias is probably defined something like this:

alias:       identifier
identifier:  /.../   # some regex

[download]

To the production for identifier you need to add an action which rejects illegal identifiers:

alias:       identifier
identifier:  /.../   # some regex
   {
      if ($item{identifier} =~ /^(?:select|insert|from|as)$/i)
         { undef }
      else
         { 1 }
   }

[download]
perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'

In reply to Re: Parse::RecDescent greedy matches by tobyink
in thread Parse::RecDescent greedy matches by zuma53

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.