String methods replaceFirst, replaceAll and split. - Java Regular Expressions

Java examples for Regular Expressions:Replace

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Description

String methods replaceFirst, replaceAll and split.

Demo Code

import java.util.Arrays;

public class Main
{
   public static void main(String[] args)
   {//w  w w .j  a va2  s .  c  om
      String firstString = "This sentence ends in 5 stars *****";
      String secondString = "1, 2, 3, 4, 5, 6, 7, 8";
         
      System.out.printf("Original String 1: %s\n", firstString);

      // replace '*' with '^'
      firstString = firstString.replaceAll("\\*", "^");

      System.out.printf("^ substituted for *: %s\n", firstString);

      // replace 'stars' with 'carets'
      firstString = firstString.replaceAll("stars", "carets");

      System.out.printf(
         "\"carets\" substituted for \"stars\": %s\n", firstString);

      // replace words with 'word'
      System.out.printf("Every word replaced by \"word\": %s\n\n",
         firstString.replaceAll("\\w+", "word"));

      System.out.printf("Original String 2: %s\n", secondString);

      // replace first three digits with 'digit'     
      for (int i = 0; i < 3; i++)
         secondString = secondString.replaceFirst("\\d", "digit");

      System.out.printf(
         "First 3 digits replaced by \"digit\" : %s\n", secondString);

      System.out.print("String split at commas: ");
      String[] results = secondString.split(",\\s*"); // split on commas
      System.out.println(Arrays.toString(results)); // display results
   } 
}

Result


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