Here's a single-pass alternative to this (uses the same test-vector set):
BEGIN {
my %mask = ( q{"} => q{"***"}, q{'} => q{'***'}, );
my $connector = qr{ => | : }xms;
sub elide {
my ($key, # pattern: arm sensitive sub-string elision
$string,
) = @_;
$string =~ s{
((?<! \\) ['"]) $key \g-1 \s*
$connector \s*
\K
\g-1 ((?! \g-2 | \\) .)* (?: \\. (?2)*)* \g-2
}
{$mask{$1}}xmsg;
return $string;
}
} # end BEGIN block
Whether this variation is preferable is very much a matter of taste. The BEGIN block is required so that certain scalars | lexicals (the %mask hash in particular, $connector not so much since it could easily be inlined) will be guaranteed to be properly initialized. Very much dependent on 5.10 regex extensions.
Give a man a fish: <%-{-{-{-<
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