java.util.regex is a built-in Java package used for working with Regular Expressions (Regex). It provides classes for matching, searching, validating, and manipulating text patterns. The package is useful for tasks such as input validation, text searching, and pattern detection. Its main classes include Pattern and Matcher.
Important Features:
- Provides built-in classes for regular expression processing.
- Supports text pattern matching.
- Helps validate user input.
- Supports searching and extracting text.
- Supports replacing matched text.
- Makes complex text-processing tasks easier.
Built-in Classes in java.util.regex
| Class | Description | Main Purpose |
|---|---|---|
Pattern |
Represents a compiled regular expression. | Creates and manages regex patterns. |
Matcher |
Performs matching operations on a character sequence. | Searches and checks text against a pattern. |
PatternSyntaxException |
Represents an error caused by an invalid regular expression. | Handles invalid regex patterns. |
MatchResult |
Represents the result of a successful match. | Provides information about a matched pattern. |
Matcher |
Maintains the state of a matching operation. | Finds, checks, and retrieves matches. |