Java 正则表达式附加/替换

//from nowjava.com - 时  代  Java

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import java.util.regex.Matcher;

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import java.util.regex.Pattern;

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public class Main {

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  public static void main(String[] argv) {

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    String input = "Thanks, thanks very much";

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    String regex = "([Tt])hanks";

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    Pattern pattern = Pattern.compile(regex);

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    Matcher matcher = pattern.matcher(input);

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    StringBuffer sb = new StringBuffer();

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    while (matcher.find()) {

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      if (matcher.group(1).equals("T")) {

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        matcher.appendReplacement(sb, "Thank you");

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      } else {

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        matcher.appendReplacement(sb, "thank you");

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      }

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    }

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    matcher.appendTail(sb);

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    System.out.println(sb.toString());

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    sb.setLength(0);

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    matcher.reset();/** n o w j a v a . c o m 提 供 **/

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    String replacement = "$1hank you";

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    while (matcher.find()) {

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      matcher.appendReplacement(sb, replacement);

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    }

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    matcher.appendTail(sb);

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