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  1. import java.util.*;
  2. import java.util.regex.*;
  3. import java.util.stream.*;
  4.  
  5. /* Name of the class has to be "Main" only if the class is public. */
  6. class Ideone {
  7.   public static void main(String[] args) throws java.lang.Exception {
  8.     Map<String, String> replacements = new HashMap<>();
  9.     replacements.put("\\u003C", "<");
  10.     replacements.put("\\u003E", ">");
  11.  
  12.     String data = "!Hello, \\u003C is my string \\u003E*";
  13.  
  14.     Pattern p =
  15.         Pattern.compile(
  16.             replacements.keySet().stream().map(Pattern::quote).collect(Collectors.joining("|")));
  17.  
  18.     StringBuilder sb = new StringBuilder(data.length());
  19.     Matcher m = p.matcher(data);
  20.     int prev = 1;
  21.     while (m.find()) {
  22.       sb.append(data, prev, m.start());
  23.       sb.append(replacements.get(m.group()));
  24.       prev = m.end();
  25.     }
  26.     sb.append(data, prev, data.length() - 1);
  27.  
  28.     System.out.println(data);
  29.     System.out.println(sb);
  30.   }
  31. }
  32.  
Success #stdin #stdout 0.13s 4386816KB
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Standard input is empty
stdout
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!Hello, \u003C is my string \u003E*
Hello, < is my string >
https://ideone.com/rVRrYA
language:
Java (HotSpot 12)
created:
8 years ago
visibility:
public

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