[Newbies] Find and replace

[an organic]

Hello,

i am new to smalltalk and i look for some easy way to find some substring in
another string and replace it by another substring:

example: string := 'Hello how are you? I am fine. Thank you and you?'
substring to find 'you' replace by 'AA'

transform to 'Hello how are AAA? I am fine. Thank AAA and AAA?'

thnx.
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