Could we create script by igamegods?

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HPNY everyone, I'm a coder, I am not afraid with code, but I dont no how to start with it. My idea ( actually, it's my wish) is I dont want to repeat search x,y in range 0xYY bytes, then select them all, then replace with new value z. So there is anywway that I can make it to a script, like just put the (x,y) and (z) anh just click excute? Any topic or tutorial to reach this ideas would appreciate ^^ Thank you in advance.