And as another strategy: 
my @temp = split /(STARTPRESERVE.*?STOPPRESERVE)/;
my $output = "";
while (@temp) {
  local $_ = shift @temp;
  s/\s+/ / unless @temp % 2;
  $output .= $_;
}

[download]

-- Randal L. Schwartz, Perl hacker

In reply to •Re: •Re: RegEx to filter \s not between labels by merlyn
in thread RegEx to filter \s not between labels by gryphon

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