| Meta- Character | Java | Ersatz | Bedeutung |
|---|---|---|---|
| \d | "\\d" | [0-9] | Digits |
| \D | "\\D" | [^0-9] | None Digits |
| \s | "\\s" | [ \t\n\r\f] | Whitespaces |
| \S | "\\S" | [^ \t\n\r\f] | None Whitespaces |
| \w | "\\w" | [a-zA-Z0-9_] | Word Characters (ohne Umlaute) |
| \W | "\\W" | [^a-zA-Z0-9_] | None Word Characters |
| \b | "\\b" | word start/end | |
| \B | "\\B" | between word or in word |