You need the /e switch in substitution.
Use smth like 
s{<figr n="([^"]+)">(.*?)</figr>}
{'<FIGIND NUM="'.$1.'" ID="FG.'.sprintf("%03d", $1).'">'.$2.'</FIGIND>
+'}eg;

[download]
instead of the snippet you have shown.
     s;;Just-me-not-h-Ni-m-P-Ni-lm-I-ar-O-Ni;;tr?IerONim-?HAcker ?d;print

In reply to Re: Matching a pattern in Regex by Ieronim
in thread Matching a pattern in Regex by rsriram

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