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if ( /<gene_seq ([^>]+)>/ ) { ... my %attribHash = split( /\s+=\s+|(?<=\w\")\s+(?=\w)/, $attribStrin +g ); # That's it; now work with the keys and values of that hash...
die "Bad xml tag:\n$_\n" if ( grep( /\"/, keys %attribHash );