020 |a 9780470086223 (hardback)         24510 |a Heads in the sand : |b how the Republicans screw up foreign policy and foreign policy screws up the Democrats / |c Matthew Yglesias         24610 |a How the Republicans screw up foreign policy and foreign policy screws up the Democrats         61020 |a Democratic Party (U.S.) #### if ($MARC_page =~ m{ (?:020<)? # MARC code followed by a bracket to identify .*? # followed by anything \|a\s # followed by a pipe and the subfield (\d{13}) # followed by a 13-digit ISBN code }xmgs) { my $isbn = $1; } if ($MARC_page =~ m{ 245\d{0,2} # MARC code 245 followed by 0-2 indicators .*? # followed by anything \|a\s # followed by a pipe and the subfield (.*?) # followed by the title \| # followed by a pipe and the next subfield }xmgs) { my $title = $1; }