Quick demo of Regular Expressions substitution

   

/*
 * Copyright (c) Ian F. Darwin, http://www.darwinsys.com/, 1996-2002.
 * All rights reserved. Software written by Ian F. Darwin and others.
 * $Id: LICENSE,v 1.8 2004/02/09 03:33:38 ian Exp $
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 * modification, are permitted provided that the following conditions
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 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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 * Java, the Duke mascot, and all variants of Sun's Java "steaming coffee
 * cup" logo are trademarks of Sun Microsystems. Sun's, and James Gosling's,
 * pioneering role in inventing and promulgating (and standardizing) the Java 
 * language and environment is gratefully acknowledged.
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 * The pioneering role of Dennis Ritchie and Bjarne Stroustrup, of AT&T, for
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import java.util.regex.*;

/**
 * Quick demo of RE substitution: correct "demon" and other
 * spelling variants to the correct, non-satanic "daemon".
 * @author Ian F. Darwin, http://www.darwinsys.com/
 * @version $Id: ReplaceDemo.java,v 1.5 2004/02/09 03:33:42 ian Exp $
 */
public class ReplaceDemo {
  public static void main(String[] argv) {

    // Make an RE pattern to match almost any form (deamon, demon, etc.).
    String patt = "d[ae]{1,2}mon";  // i.e., 1 or 2 'a' or 'e' any combo

    // A test input.
    String input = "Unix hath demons and deamons in it!";
    System.out.println("Input: " + input);

    // Run it from a RE instance and see that it works
    Pattern r = Pattern.compile(patt);
    Matcher m = r.matcher(input);
    System.out.println("ReplaceAll: " + m.replaceAll("daemon"));

    // Show the appendReplacement method
    m.reset();
    StringBuffer sb = new StringBuffer();
    System.out.print("Append methods: ");
    while (m.find()) {
      m.appendReplacement(sb, "daemon");  // Copy to before first match,
                        // plus the word "daemon"
    }
    m.appendTail(sb);            // copy remainder
    System.out.println(sb.toString());
  }
}

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Quick demo of Regular Expressions substitution : String Operation « Regular Expressions « Java

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