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  1. import java.util.*;
  2. import java.util.regex.*;
  3. import java.lang.*;
  4. import java.io.*;
  5.  
  6. class Ideone {
  7.   public static void main (String[] args) throws java.lang.Exception {
  8.     var str = "a.b.c..d..!..e!!...!!!f....!!.!!!...";
  9.  
  10.     var res = Pattern.compile("[.!]").matcher(str)
  11.               .replaceAll(m -> m.group().equals(".") ? "!" : ".");
  12.  
  13.     System.out.println(str);
  14.     System.out.println(res);
  15.   }
  16. }
Success #stdin #stdout 0.1s 48012KB
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stdin
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Standard input is empty
stdout
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a.b.c..d..!..e!!...!!!f....!!.!!!...
a!b!c!!d!!.!!e..!!!...f!!!!..!...!!!
https://ideone.com/02Z0vQ
language:
Java (HotSpot 12)
created:
2 years ago
visibility:
public

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