带示例的 CharMatcher 字段|番石榴|爪哇

原文:https://www . geesforgeks . org/charmatcher-fields-with-examples-guava-Java/

CharMatcher 类提供以下常量来获取 CharMatcher 实例。

以下是其中的一些

手指

CharMatcher。数字根据 Unicode 判断一个字符是否是数字。如果您只想匹配 ASCII 数字，可以使用范围(' 0 '，' 9 ')。 句法:

public static final CharMatcher DIGIT

下面是上述字段的实现。

程序 1:

// Program for CharMatcher.DIGIT field in Java
import com.google.common.base.CharMatcher;

class GFG {

    // Driver code
    public static void main(String args[])
    {
        // Input string to check for matching
        String input = "123 is divisible by 3";

        // Printing the input
        System.out.println(input);

        // Declaring a CharMatcher object
        CharMatcher matcher = CharMatcher.DIGIT;

        // Retaining the result after matching
        String result = matcher.retainFrom(input);

        // Printing the result
        System.out.println(result);
    }
}

Output:

123 is divisible by 3
1233

```</u> 

<u>**参考:**[https://Google . github . io/guava/releases/19.0/API/docs/com/Google/common/base/charmatcher . html # DIGIT](https://google.github.io/guava/releases/19.0/api/docs/com/google/common/base/CharMatcher.html#DIGIT)</u>

### <u><u>爪哇 _ 字母</u></u>

 <u>**CharMatcher。JAVA_LETTER** 根据 JAVA 的定义判断一个字符是字母还是数字。
**句法**:

```java
public static final CharMatcher JAVA_LETTER

下面是上述字段的实现。

程序 1:

// Program for CharMatcher.JAVA_LETTER field in Java
import com.google.common.base.CharMatcher;

class GFG {

    // Driver code
    public static void main(String args[])
    {
        // Input string to check for matching
        String input = "123 is divisible by 3";

        // Printing the input
        System.out.println(input);

        // Declaring a CharMatcher object
        CharMatcher matcher = CharMatcher.JAVA_LETTER;

        // Retaining the result after matching
        String result = matcher.retainFrom(input);

        // Printing the result
        System.out.println(result);
    }
}

Output:

123 is divisible by 3
isdivisibleby

参考:https://Google . github . io/guava/releases/19.0/API/docs/com/Google/common/base/charmatcher . html # JAVA _ LETTER

ASCII

CharMatcher。ASCII 确定一个字符是否为 ASCII，表示其码位小于 128。 句法:

public static final CharMatcher ASCII

下面是上述字段的实现。

程序 1:

// Program for CharMatcher.ASCII field in Java
import com.google.common.base.CharMatcher;

class GFG {

    // Driver code
    public static void main(String args[])
    {
        // Input string to check for matching
        String input = "GeekforGeeks is fun.\u00be";

        // Printing the input
        System.out.println(input);

        // Declaring a CharMatcher object
        CharMatcher matcher = CharMatcher.ASCII;

        // Retaining the result after matching
        String result = matcher.retainFrom(input);

        // Printing the result
        System.out.println(result);
    }
}

Output:

GeekforGeeks is fun.?
GeekforGeeks is fun.

参考:https://Google . github . io/guava/releases/19.0/API/docs/com/Google/common/base/charmatcher . html # ASCII

任意

CharMatcher。任意字段匹配任意字符，即匹配所有字符。 句法:

public static final CharMatcher ANY

下面是上述字段的实现。

程序 1:

// Program for CharMatcher.ANY field in Java
import com.google.common.base.CharMatcher;

class GFG {

    // Driver code
    public static void main(String args[])
    {
        // Input string to check for matching
        String input = "GeekforGeeks is fun.";

        // Declaring a CharMatcher object
        CharMatcher matcher = CharMatcher.ANY;

        // Retaining the result after matching
        String result = matcher.retainFrom(input);

        // Printing the result
        System.out.println(result);
    }
}

Output:

GeekforGeeks is fun.

参考:https://Google . github . io/guava/releases/19.0/API/docs/com/Google/common/base/charmatcher . html # ANY

爪哇 _ 小写

CharMatcher。根据 JAVA 的定义，判断一个字符是否是小写。

语法:

public static final CharMatcher JAVA_LOWER_CASE

下面是上述字段的实现。

程序 1:

// Program for CharMatcher.JAVA_LETTER_OR_DIGIT field in Java
import com.google.common.base.CharMatcher;

class GFG {

    // Driver code
    public static void main(String args[])
    {
        // Input string to check for matching
        String input = "gEEKSfORgEEKS";

        // Printing the input
        System.out.println(input);

        // Declaring a CharMatcher object
        CharMatcher matcher = CharMatcher.JAVA_LOWER_CASE;

        // Retaining the result after matching
        String result = matcher.retainFrom(input);

        // Printing the result
        System.out.println(result);
    }
}

Output:

gEEKSfORgEEKS
gfg

```</u> 

<u>**注意:**这个类只处理字符值。它不理解 0x10000 到 0x10FFFF 范围内的补充 Unicode 代码点。这样的逻辑字符使用代理项对被编码到一个字符串中，CharMatcher 将这些字符视为两个独立的字符。</u>

<u>**参考:**[https://Google . github . io/guava/releases/19.0/API/docs/com/Google/common/base/charmatcher . html # JAVA _ low _ CASE](https://google.github.io/guava/releases/19.0/api/docs/com/google/common/base/CharMatcher.html#JAVA_LOWER_CASE)</u>

### <u><u>爪哇 _ 上位 _ 案例</u></u>

 <u>**CharMatcher。JAVA_UPPER_CASE** 根据 JAVA 的定义判断一个字符是否是大写。
**句法**:

```java
public static final CharMatcher JAVA_UPPER_CASE

下面是上述字段的实现。

程序 1:

// Program for CharMatcher.JAVA_UPPER_CASE field in Java
import com.google.common.base.CharMatcher;

class GFG {

    // Driver code
    public static void main(String args[])
    {
        // Input string to check for matching
        String input = "c++ JAVA python";

        // Printing the input
        System.out.println(input);

        // Declaring a CharMatcher object
        CharMatcher matcher = CharMatcher.JAVA_UPPER_CASE;

        // Retaining the result after matching
        String result = matcher.retainFrom(input);

        // Printing the result
        System.out.println(result);
    }
}

Output:

c++ JAVA python
JAVA

参考:https://Google . github . io/guava/releases/19.0/API/docs/com/Google/common/base/charmatcher . html # JAVA _ UPPER _ CASE

爪哇 _ 字母 _ 或 _ 数字

CharMatcher。JAVA_LETTER_OR_DIGIT 根据 JAVA 的定义判断一个字符是字母还是数字。 句法:

public static final CharMatcher JAVA_LETTER_OR_DIGIT

下面是上述字段的实现。

程序 1:

// Program for CharMatcher.JAVA_LETTER_OR_DIGIT field in Java
import com.google.common.base.CharMatcher;

class GFG {

    // Driver code
    public static void main(String args[])
    {
        // Input string to check for matching
        String input = "#13 is a prime & number%";

        // Printing the input
        System.out.println(input);

        // Declaring a CharMatcher object
        CharMatcher matcher = CharMatcher.JAVA_LETTER_OR_DIGIT;

        // Retaining the result after matching
        String result = matcher.retainFrom(input);

        // Printing the result
        System.out.println(result);
    }
}

Output:

#13 is a prime & number%
13isaprimenumber

参考:https://Google . github . io/guava/releases/19.0/API/docs/com/Google/common/base/charmatcher . html # JAVA _ LETTER _ OR _ digest

爪哇 _ 数字

CharMatcher。JAVA_DIGIT 根据 JAVA 的定义判断一个字符是否为数字。如果您只想匹配 ASCII 数字，可以使用范围(' 0 '，' 9 ')。 句法:

public static final CharMatcher JAVA_DIGIT

下面是上述字段的实现。

程序 1:

// Program for CharMatcher.JAVA_DIGIT field in Java
import com.google.common.base.CharMatcher;

class GFG {

    // Driver code
    public static void main(String args[])
    {
        // Input string to check for matching
        String input = "13 is a prime number";

        // Printing the input
        System.out.println(input);

        // Declaring a CharMatcher object
        CharMatcher matcher = CharMatcher.JAVA_DIGIT;

        // Retaining the result after matching
        String result = matcher.retainFrom(input);

        // Printing the result
        System.out.println(result);
    }
}

Output:

13 is a prime number
13

参考:https://Google . github . io/guava/releases/19.0/API/docs/com/Google/common/base/charmatcher . html # JAVA _ digest

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