guava中String的CharMatcher

1.CharMatcher的field 类型

ANY：匹配任意字符。

NONE：任何字符都不匹配

WHITESPACE：匹配字符里面的空格。

BREAKING_WHITESPACE：匹配字符之间是否被空格隔断。

INVISIBLE：确定字符是否不可见，不可见的字符包括：SPACE_SEPARATOR, LINE_SEPARATOR, PARAGRAPH_SEPARATOR, 

CONTROL, FORMAT, SURROGATE, 和PRIVATE_USE

DIGIT： Determines whether a character is a digit according to Unicode. If you only care to match ASCII digits, 

you can use inRange('0', '9').

JAVA_LETTER：Determines whether a character is a letter according to Java's definition. If you only care to 

match letters of the Latin alphabet, you can use inRange('a', 'z').or(inRange('A', 'Z'))。

JAVA_DIGIT：Determines whether a character is a digit according to Java's definition. If you only care to match

 ASCII digits, you can use inRange('0', '9')。

JAVA_LETTER_OR_DIGIT ：Determines whether a character is a letter or digit according to Java's definition.

JAVA_ISO_CONTROL ：Determines whether a character is an ISO control character as specified 

by Character.isISOControl(char).

JAVA_LOWER_CASE： Determines whether a character is lower case according to Java's definition.

JAVA_UPPER_CASE ：Determines whether a character is upper case according to Java's definition.

ASCII：Determines whether a character is ASCII, meaning that its code point is less than 128.

SINGLE_WIDTH：Determines whether a character is single-width (not double-width). When in doubt,

 this matcher errs on the side of returning false (that is, it tends to assume a character is double-width).

2.CharMatcher的经常使用方法与实例

运行结果：

removeForm:aa

retainForm:aa
replaceFrom_1:afbcd
replaceFrom_2:aThreebcd
trimFrom:cat
trimLeadingFrom:catabb
trimTrailingFrom:abacat
collapseFrom:-ookk-p-
trimAndCollapseFrom:ookk-p
matchesAnyOf:false
or:59F
negate:ddcF