EASY Task?

[Gintaras]

I am new to Quick Macros

Try LibreAutomate. It is similar to Quick Macros.

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Easy if the substring is known.
Example in LibreAutomate:

Code:

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// script ""
string s = "repeatable stringrepeatable string";
if (s.RxFindAll(@"repeatable string", out var matches) && matches.Length > 1) {
    for (int i = matches.Length; --i >= 1; ) {
        var m = matches[i];
        s = s.Remove(m.Start..m.End);
    }
}
print.it(s);