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  • Java

    验证

    简单验证

    String regex = "\d{4}-\d{2}-\d{2}";
    String input = "2016-01-01";
    assertTrue(input.matches(regex));
    assertTrue(Pattern.matches(regex, input));

    提取

    String regex = "\d{4}-\d{2}-\d{2}";
    String input = "2016-01-01, 2016-02-02. [2016-03-03]";
    Pattern pattern = Pattern.compile(regex);
    Matcher matcher = pattern.matcher(input);
    while (matcher.find()) {
        System.out.println(matcher.group());
    }

    替换

    简单替换

    String regex = "(\d{4})-(\d{2})-(\d{2})";
    String replacement = "$2/$3/$1";
    String input = "2016-01-15, 2016-02-15.";
    String actual = input.replaceAll(regex, replacement);
    String expected = "01/15/2016, 02/15/2016.";
    assertEquals(expected, actual);

    使用 Pattern 对象,方便反复使用

    String regex = "(\d{4})-(\d{2})-(\d{2})";
    String replacement = "$2/$3/$1";
    String input = "2016-01-15, 2016-02-15.";
    Pattern pattern = Pattern.compile(regex);
    Matcher matcher = pattern.matcher(input);
    String actual = matcher.replaceAll(replacement);
    String expected = "01/15/2016, 02/15/2016.";
    assertEquals(expected, actual);

    切分

    简单切分

    String regex = "\s+";
    String input = "a  b	c";
    String[] actuals = input.split(regex);
    String[] expecteds = new String[] {"a", "b", "c"};
    assertArrayEquals(expecteds, actuals);

    使用 Pattern 对象,方便反复使用

    String regex = "\s+";
    String input = "a  b	c";
    Pattern pattern = Pattern.compile(regex);
    String[] actuals = pattern.split(input);
    String[] expecteds = new String[] {"a", "b", "c"};
    assertArrayEquals(expecteds, actuals);
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  • 原文地址:https://www.cnblogs.com/huey/p/5531065.html
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