$text = "A(B(2)+C(D())),\nTT(TT()+TT(TT()))";
$text = doFunc( "MAIN", $text );  #
print "Example: $text\n";

sub doFunc{
   my( $theFunc, $theParam ) = @_;

   # FIXME: greedy match fails with: 'TT(TT()+TT(TT()))'
   my $re;
   {local $^W=0; ($re=$theParam)=~s/((\()|(\))|.)/${[')']}[!$3]\Q$1\E$
+{['(']}[!$2]/gs;
   $re= join'|',map{quotemeta}eval{$theParam=~/$re/};}
   die $@ if $@=~/unmatched/;

   $theParam =~ s/([A-Z]+)\(($re)\)/&doFunc($1,$2)/geo;

   my $result = "";

   if( $theFunc eq "MAIN" ) {
     $result = $theParam;

   } else {
     # dummy switch here for demonstration
     # this would be an elsif for each function
     $result = "func $theFunc returns <$theParam>";

   }

   return $result;
}

[download]
Update: Why does this dump core when the /o is removed?

In reply to Re: How to find matching pairs by I0
in thread How to find matching pairs by Anonymous Monk

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.