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$in='1_abc/2_deg/bla_30_31_blah';

...
#This works if the second number is a single digit 
$out=substr $in, index( $in, '_') + 1;
substr( $out, index( $out, '_') - 1, 2)='';

$out=substr $in, index( $in, '_') + 1;
substr( $out, $us = index( $out, '/') + 1, index( $out, '_')- $us + 1)
+='';