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

Matcher

declaration

public final class Matcher implements MatchResult

The stateful matching engine: matches() (whole input) vs find() (next occurrence), group access by index or name, and replace operations.

Key methods

`boolean matches()`	Entire input must match.
`boolean find()`	Advance to the next match — loop it.
`String group(int n) / group(String name)`	Captured text (group 0 = whole match).
`String replaceAll(String replacement)`	$1 references groups; Matcher.quoteReplacement for literals.