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public class MatcherDemo { 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 pattern = Pattern.compile(REGEX); // get a matcher object Matcher matcher = pattern.matcher(INPUT); INPUT = matcher.replaceFirst(REPLACE); System.out.println(INPUT); } }
运行结果 :
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