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    $match_count += 1 if ($subject =~ /^[RE:\s*|FW:\s*]*$match_string\i*$/
    +);
    
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    Nested quantifiers in regex; marked by <-- HERE in m/^[RE:\s*|FW:\s*]*
    +Are you a Perfect Sinhalese??? 
    <-- HERE ?\s*$/ at C:/Perl/lib/LTG/DocBuddy/Relation.pm line 496.