Or 
s/(?<=30\.00\.)[0-9][0-9]\.[0-9][0-9]/00.00/g

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لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

In reply to Re^2: Shortest way to replace a string by choroba
in thread Shortest way to replace a string by nikfr

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