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You seem to be arbitrarily splitting on spaces. This will break unless there's a clear space either side of the +. A better option would be as follows.
my $text = '1&plus;2<maths> &plus; dfdf</maths>'; my $output = ""; while ($text =~ m/((<maths>.*?<\/maths>)|([^<]*))/gs) { if ($2) { $output .= $2; } else { my $segment = $3; $segment =~ s/&plus;/&thinsp;&plus;&thinsp;/g; $output .= $segment; } } print $output . "\n";
The basic premise being to scoop up and ignore (push onto output) anything in <maths>, or scope up as much that can easily be determined not to be in <maths> (ie no angle brackets) and parse that before putting it on the output.

In reply to Re^2: Regular Expression Doubt by reasonablekeith
in thread Regular Expression Doubt by Anonymous Monk

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