another way to improve readability are named captures, here an approach to build a hash of hashes.

  DB<152> %project =()

  DB<153> $_="A B C"
 => "A B C"

  DB<154> m/(?<url>\w) (?<id>\w) (?<title>\w)/;     $project{ $+{id} }
+ = { %+ }
 => { id => "B", title => "C", url => "A" }
  DB<155> \%project
 => { B => { id => "B", title => "C", url => "A" } }
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(line 154 should be two, but the debugger can't keep matches alive after quitting eval)

if you prefer AoAs just do push @projects, [ values %+ ] , ... and so on.