From perlop, "«?pattern?» is just like the «/pattern/» search, except that it matches only once between calls to the reset() operator."

You clearly didn't mean to use the ?pattern? operator. Fix:

   $o_vers = $1 if $STAGE[$j] =~ m{/rdbms/([\d.]+)/} ;
   $o_vers = $1 if $STAGE[$j] =~ m{/rdbms/patches/([\d.]+)/} ;
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