You could use last, or at least an oppositely-named variable:

my $no_match = 1;
while ($pb->... and $no_match) {
  # ...
  $no_match = 0;
}
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Jeff[japhy]Pinyan: Perl, regex, and perl hacker, who'd like a (from-home) job
s++=END;++y(;-P)}y js++=;shajsj<++y(p-q)}?print:??;