Works for me: 
$_ = "T}\@T...T}\@T{";
s/T\}\@T.*T\}\@T\{/\\(bu/sm;
print;

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Output: 

\(bu

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لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

In reply to Re: special character substitution by choroba
in thread special character substitution by bill b

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