Java replaceFirst 和replaceAll 方法，replacefirst

Java replaceFirst 和replaceAll 方法，replacefirst

replaceFirst 和replaceAll 方法用來替換匹配Regex的文本。不同的是，replaceFirst 替換最初相符，replaceAll 替換所有匹配。

下面的例子來解釋這個功能：

import java.util.regex.Matcher;import java.util.regex.Pattern;public class RegexMatches{    private static String REGEX = "dog";    private static String INPUT = "The dog says meow. " +                                    "All dogs say meow.";    private static String REPLACE = "cat";    public static void main(String[] args) {       Pattern p = Pattern.compile(REGEX);       // get a matcher object       Matcher m = p.matcher(INPUT);        INPUT = m.replaceAll(REPLACE);       System.out.println(INPUT);   }}

以上執行個體編譯運行結果如下：

The cat says meow. All cats say meow.