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  1. or download 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
  2. or download this
    (?(condition)yes-pattern|no-pattern)
(?(condition)yes-pattern)
...

matches a chunk of non-parentheses, possibly included
in parentheses themselves.