As a side note, you can clean up that regex quite a bit by using + instead of {1,}, and not escaping colons, semi-colons, and equals: 

   #if($line=~/^(Gm\d{1,})\trecent_duplication\tsyntenic_region\t(\d{1
+,})\t(\d{1,})\t.*\tID\=\w{1,}_Gm\d{1,}\.(Gm\d{1,}.*)\;median_Ks=(.*)\
+;matches\=(Gm\d{1,}\:\d{1,}\.\.\d{1,})/)

   if($line=~/^(Gm\d+)\trecent_duplication\tsyntenic_region\t(\d+)\t(\
+d+)\t.*\tID=\w+_Gm\d+\.(Gm\d+.*);median_Ks=(.*);matches=(Gm\d+:\d+\.\
+.\d+)/)

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In reply to Re^4: hash with both values and keys unique to each other by hbm
in thread hash with both values and keys unique to each other by perlkhan77

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