[Solved] Replace String variable with exact string

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If I understand your question, you could use String.replace(CharSequence, CharSequence) like

String str="abcd";
String rep="cd";
String nv = "kj";
str = str.replace(rep, nv); // <-- old, new
System.out.println(str);

Output is (the requested)

abkj

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solved Replace String variable with exact string