There's a module especially for this kind if thing: Text::Balanced. Here is an example of how you could use it.
#!/usr/bin/perl -w
use strict;
use Text::Balanced qw (extract_bracketed);
my $text = "In (Madrid) (Spain";
my ($extracted, $remainder, $skipped);
my $newtext = "";
for (;;) {
($extracted, $remainder, $skipped) = extract_bracketed($text,'()','
+[^\(]*');
if ($extracted) {
$newtext .= $skipped;
$newtext .= $extracted;
$text = $remainder;
} else {
if ($@->{error} =~ /Unmatched opening/) {
$remainder =~ s/\(/ /;
$text = $remainder;
} elsif ($@->{error} =~ /Did not find opening bracket/) {
$newtext .= $remainder;
last;
} else {
die "Unexpected text balance error: $@";
}
}
}
print "Now text is: *$newtext*\n";
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