How about this:
$str =~ s/(^|[^\%](?:\%\%)*)\%
(\{)? # Match and capture 1 or 0 braces
([_a-zA-Z]\w*)
(?(2)\}) # If there's anything in $2, match en
+ding brace
/"$1".$env->{$3}/gex; # $3 now instead of $2 here
This takes advantage of perl's conditional matching operator. From perlre:
(?(condition)yes-pattern|no-pattern)
(?(condition)yes-pattern)
Conditional expression. (condition) should be either
an integer in parentheses (which is valid if the
corresponding pair of parentheses matched), or
lookahead/lookbehind/evaluate zero-width assertion.
Say,
m{ ( \( )?
[^()]+
(?(1) \) )
}x
matches a chunk of non-parentheses, possibly included
in parentheses themselves.
-
Are you posting in the right place? Check out Where do I post X? to know for sure.
-
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
-
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
-
Want more info? How to link
or How to display code and escape characters
are good places to start.
|