import java.util.*;
import java.lang.*;
import java.io.*;
class Ideone
{
{
String text
= "If you look at what you have in life, you'll always have more. If you look at what you don't have in life, you'll never have enough"; String result
= text.
replaceAll("(?s)(\\G(?!\\A)|ok)((?:(?!ok|fe|t).)*)t(?=(?:(?!ok|fe).)*fe)",
"$1$2!"); }
}
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