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my @chunks = $sysex_dump =~ /\xF0C.[~z]((?:..LM  0087[A-Z][A-Z].+?)+)\
+xF7/gs;
my @parts;
...
{
    push @parts, $1 while /(..LM  0087[A-Z][A-Z].+?)/gs;
}

  (..LM  0087[A-Z][A-Z].+?)
#  ^^ <= here they are

/\xF0C.[~z](\.\.LM  0087[A-Z][A-Z].+?)+\xF7/s