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- PatternSyntaxException Class
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- Java Regex - Characters
- Java Regex - Character Classes
- Predefined Character Classes
- POSIX Character Classes
- Java Regex - JAVA Character Classes
- Unicode Character Classes
- Java Regex - Boundary Matchers
- Java Regex - Greedy quantifiers
- Java Regex - Reluctant quantifiers
- Java Regex - Possessive quantifiers
- Java Regex - Logical Operators
- Java Regex Useful Resources
- Java Regex - Quick Guide
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- Java Regex - Discussion
Matching Predefined Character Classes
Following are various examples of matching predefined character classes using regular expression in java.
| Sr.No | Construct & Matches |
|---|---|
| 1 | .
Any character (may or may not match line terminators). |
| 2 | \d
A digit: [0-9]. |
| 3 | \D
A non-digit: [^0-9]. |
| 4 | \s
A whitespace character: [ \t\n\x0B\f\r] |
| 5 | \S
A non-whitespace character: [^\s]. |
| 6 | \w
A word character: [a-zA-Z_0-9]. |
| 7 | \W
A non-word character: [^\w] |
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