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$toencode=~s/([^a-zA-Z0-9_.-])/uc sprintf("%%%02x",ord($1))/eg;

# Build a char->hex map
for (0..255) {
    $escapes{chr($_)} = sprintf("%%%02X", $_);
}
$text =~ s/([^;\/?:@&=+\$,A-Za-z0-9\-_.!~*'()])/$escapes{$1}/g;