An instance of the Pattern class represents a regular expression that is specified in string form in a syntax similar to that used by Perl.
Instances of the Matcher class are used to match character sequences against a given pattern. Input is provided to matchers via the CharSequence interface in order to support matching against characters from a wide variety of input sources.
Unless otherwise noted, passing a null argument to a method in any class or interface in this package will cause a NullPointerException to be thrown.
An excellent tutorial and overview of regular expressions is Mastering Regular Expressions, Jeffrey E. F. Friedl, O'Reilly and Associates, 1997.
| Class | Description |
|---|---|
| Matcher | An engine that performs match operations on a character sequence by interpreting a Pattern. |
| MatchResult | The result of a match operation. |
| Pattern | A compiled representation of a regular expression. |
| PatternSyntaxException | Unchecked exception thrown to indicate a syntax error in a regular-expression pattern. |
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https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/util/regex/package-summary.html