Java CharMatcher字段与实例

CharMatcher类提供了以下常量来获得CharMatcher实例。

CharMatcher字段与实例 Guava Java

下面是其中的一些

数字

CharMatcher.DIGIT 根据Unicode确定一个字符是否是一个数字。如果你只关心匹配ASCII数字，你可以使用inRange(‘0’, ‘9’ ) 。

语法

public static final CharMatcher DIGIT

以下是上述领域的实现情况。

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);
    }
}

输出:

123 is divisible by 3
1233

参考资料: https://google.github.io/guava/releases/19.0/api/docs/com/google/common/base/CharMatcher.html#DIGIT

JAVA_LETTER

CharMatcher.JAVA_LETTER 根据Java的定义来确定一个字符是字母还是数字。

语法

public static final CharMatcher JAVA_LETTER

以下是上述领域的实现情况。

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);
    }
}

输出:

123 is divisible by 3
isdivisibleby

参考资料: 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，即其码位小于128。

语法:

public static final CharMatcher ASCII

以下是上述领域的实现情况。

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);
    }
}

输出:

GeekforGeeks is fun.?
GeekforGeeks is fun.

参考资料: https://google.github.io/guava/releases/19.0/api/docs/com/google/common/base/CharMatcher.html#ASCII

ANY

CharMatcher.ANY 字段匹配任何字符，即匹配所有字符。

语法

public static final CharMatcher ANY

以下是上述领域的实现情况。

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);
    }
}

输出:

GeekforGeeks is fun.

参考资料: https://google.github.io/guava/releases/19.0/api/docs/com/google/common/base/CharMatcher.html#ANY

java_lower_case

CharMatcher.JAVA_LOWER_CASE 根据Java的定义来确定一个字符是否为小写。

语法:

public static final CharMatcher JAVA_LOWER_CASE

以下是上述领域的实现情况。

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);
    }
}

输出:

gEEKSfORgEEKS
gfg

注意： 这个类只处理char值。它不理解0x10000到0x10FFFF范围内的补充Unicode代码点。这样的逻辑字符是用代理对编码成一个字符串的，CharMatcher只是把它们当作两个独立的字符。

参考：https://google.github.io/guava/releases/19.0/api/docs/com/google/common/base/CharMatcher.html#JAVA_LOWER_CASE

JAVA_Upper_case

CharMatcher.JAVA_UPPER_CASE 根据Java的定义来决定一个字符是否是大写字母。

语法:

public static final CharMatcher JAVA_UPPER_CASE

以下是上述领域的实现情况。

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);
    }
}

输出:

c++ JAVA python
JAVA

参考资料 ：https://google.github.io/guava/releases/19.0/api/docs/com/google/common/base/CharMatcher.html#JAVA_UPPER_CASE

java_letter_or_digit

CharMatcher.JAVA_LETTER_OR_DIGIT 根据Java的定义来确定一个字符是字母还是数字。

语法:

public static final CharMatcher JAVA_LETTER_OR_DIGIT

以下是上述领域的实现情况。

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);
    }
}

输出:

#13 is a prime & number%
13isaprimenumber

参考资料: https://google.github.io/guava/releases/19.0/api/docs/com/google/common/base/CharMatcher.html#JAVA_LETTER_OR_DIGIT

JAVA_DIGIT

CharMatcher.JAVA_DIGIT 根据Java的定义来确定一个字符是否为数字。如果只关注ASCII数字的匹配，可以使用inRange(‘0’, ‘9’ ) 。
语法:

public static final CharMatcher JAVA_DIGIT

以下是上述领域的实现情况。

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);
    }
}

输出: