java.util.regex · java.base · since Java 1.4

Pattern

declaration

public final class Pattern implements Serializable

A compiled regular expression — compile once as a static final constant, then hand out Matchers. Flags, named groups, and stream-friendly splitting included.

Key methods

`static Pattern compile(String regex, int flags)`	CASE_INSENSITIVE, MULTILINE, DOTALL…
`Matcher matcher(CharSequence input)`	The matching engine (not thread-safe; Pattern is).
`String[] split(CharSequence) / Stream<String> splitAsStream(…)`	Regex splitting.
`static String quote(String s)`	Escape a literal for embedding in a regex.
`Predicate<String> asMatchPredicate()`	Whole-string predicate for filter chains.