Determines a true or false value for any Java char value, just as Predicate does for any Object. Also offers basic text processing methods based on this function. Implementations are strongly encouraged to be side-effect-free and immutable.
Throughout the documentation of this class, the phrase “matching character” is used to mean “any character c for which this.matches(c) returns true”.
Note: This class deals only with char values; it does not understand supplementary Unicode code points in the range 0x10000 to 0x10FFFF. Such logical characters are encoded into a String using surrogate pairs, and a CharMatcher treats these just as two separate characters.

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