CharacterClass (saxon JavaDoc)

All Superinterfaces:

IntPredicate

All Known Implementing Classes:

Categories.Category, EmptyCharacterClass, IntSetCharacterClass, InverseCharacterClass, PredicateCharacterClass, RECompiler.BackReference, SingletonCharacterClass
```
public interface CharacterClass
extends IntPredicate
```
A character class represents a set of characters for regex matching purposes. It extends IntPredicate, so there is a mechanism for testing whether a particular codepoint is a member of the class. In addition it provides a method for testing whether two classes are disjoint, which is used when optimizing regular expressions.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`IntSet`	`getIntSet()`	Get the set of matching characters if available.
`boolean`	`isDisjoint(CharacterClass other)`	Ask whether this character class is known to be disjoint with another character class (that is, the two classes have no characters in common).

Methods inherited from interface java.util.function.IntPredicate
and, negate, or, test

- Method Detail
  - isDisjoint
```
boolean isDisjoint(CharacterClass other)
```
    Ask whether this character class is known to be disjoint with another character class (that is, the two classes have no characters in common). If in doubt, return false.
    
    Parameters:
    
    other - the other character class
    
    Returns:
    
    true if the character classes are known to be disjoint; false if there may be characters in common between the two classes
  - getIntSet
```
IntSet getIntSet()
```
    Get the set of matching characters if available. If not available, return null