| Character Class Meta-Character | Matches |
| \p{Lower} | Lowercase letter [a-z] |
| \p{Upper} | Uppercase letter [A-Z] |
| \p{ASCII} | All ASCII [\x00-\x7F] |
| \p{Alpha} | Any lowercase or uppercase letter |
| \p{Digit} | A digit [0–9] |
| \p{Alnum} | Any letter or digit |
| \p{Punct} | Punctuation [!"#$%&'()*+,-./:;<=>?@[\]^_`{|}~] |
| \p{Graph} | A visible character: any letter, digit, or punctuation |
| \p{Print} | A printable character; same as \p{Graph} |
| \p{Blank} | A space or tab [ \t] |
| \p{Cntrl} | A control character [\x00-\x1F\x7F] |
| \p{XDigit} | Hexadecimal digit [0–9a–fA–F] |
| \p{Space} | A whitespace character [ \t\n\x0B\f\r] |
| 8.1.Introduction | ||||
| 8.1.1. | Meta-characters predefined to match specific characters. | |||
| 8.1.2. | Meta-characters to match against certain string boundaries. | |||
| 8.1.3. | Regular expression languages also have character classes. | |||
| 8.1.4. | POSIX character classes and Java character classes | |||
| 8.1.5. | Java Character Class | |||
| 8.1.6. | Match a particular character a specified number of times. | |||
| 8.1.7. | Read regular expression from console | |||
| 8.1.8. | Regex Test Harness | |||
| 8.1.9. | Match Java source file and file and class name | |||
| 8.1.10. | Finding all words that start with an 'a' | |||
| 8.1.11. | Simple validation using the Pattern and Matcher objects | |||
| 8.1.12. | A possessive qualifier | |||
| 8.1.13. | Find the starting point of the second 'Bond' | |||
| 8.1.14. | A negative look ahead | |||
| 8.1.15. | A negative behind ahead | |||
| 8.1.16. | A positive look ahead | |||
| 8.1.17. | Pattern helper | |||
| 8.1.18. | Escapes characters that have special meaning to regular expressions | |||