Whitespace, not words.
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@ -81,7 +81,7 @@ sub FetchPossibleHeaders {
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if ($head->get('References')) {
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chomp();
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foreach my $ref (split("\w+", $_)) {
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foreach my $ref (split(/\s+/, $_)) {
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$ref =~ /,?<([^>]+)>/;
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if ($1) {
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push(@msgids, $1);
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