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Beschreibung
Reguläre Ausdrücke sind Muster, mit denen man den Aufbau von Zeichenketten beschreibt.
Characters
| Ausdruck |
Bedeutung
|
x
|
The character x
|
\\
|
The backslash character
|
\0n
|
The character with octal value 0n (0 <= n <= 7)
|
\0nn
|
The character with octal value 0nn (0 <= n <= 7)
|
\0mnn
|
The character with octal value 0mnn (0 <= m <= 3, 0 <= n <= 7)
|
\xhh
|
The character with hexadecimal value 0xhh
|
\uhhhh
|
The character with hexadecimal value 0xhhhh
|
\t
|
The tab character ('\u0009')
|
\n
|
The newline (line feed) character ('\u000A')
|
\r
|
The carriage-return character ('\u000D')
|
\f
|
The form-feed character ('\u000C')
|
\a
|
The alert (bell) character ('\u0007')
|
\e
|
The escape character ('\u001B')
|
\cx
|
The control character corresponding to x
|
Character classes
| Ausdruck |
Bedeutung
|
xxx
|
xxx
|
xxx
|
xxx
|
Predefined character classes
| Ausdruck |
Bedeutung
|
xxx
|
xxx
|
xxx
|
xxx
|
POSIX character classes (US-ASCII only)
| Ausdruck |
Bedeutung
|
xxx
|
xxx
|
xxx
|
xxx
|
Classes for Unicode blocks and categories
| Ausdruck |
Bedeutung
|
xxx
|
xxx
|
xxx
|
xxx
|
Boundary matchers
| Ausdruck |
Bedeutung
|
xxx
|
xxx
|
xxx
|
xxx
|
Greedy quantifiers
| Ausdruck |
Bedeutung
|
xxx
|
xxx
|
xxx
|
xxx
|
Reluctant quantifiers
| Ausdruck |
Bedeutung
|
xxx
|
xxx
|
xxx
|
xxx
|
Possessive quantifiers
| Ausdruck |
Bedeutung
|
xxx
|
xxx
|
xxx
|
xxx
|
Logical operators
| Ausdruck |
Bedeutung
|
XY
|
X followed by Y
|
| Y
|
Either X or Y
|
(X)
|
X, as a capturing group
|
Back references
| Ausdruck |
Bedeutung
|
\n
|
Whatever the nth capturing group matched
|
Quotation
| Ausdruck |
Bedeutung
|
\
|
Nothing, but quotes the following character
|
\Q
|
Nothing, but quotes all characters until \E
|
\E
|
Nothing, but ends quoting started by \Q
|
Special constructs (non-capturing)
| Ausdruck |
Bedeutung
|
(?:X)
|
X, as a non-capturing group
|
(?idmsux-idmsux)
|
Nothing, but turns match flags on - off
|
(?idmsux-idmsux:X)
|
X, as a non-capturing group with the given flags on - off
|
(?=X)
|
X, via zero-width positive lookahead
|
(?!X)
|
X, via zero-width negative lookahead
|
(?<=X)
|
X, via zero-width negative lookahead
|
(?>X)
|
X, as an independent, non-capturing group
|
Embedded flag expressions
| Ausdruck |
Bedeutung
|
(?u)
|
Pattern.UNICODE_CASE
|
(?s)
|
Pattern.DOTALL
|
(?m)
|
Pattern.MULTILINE
|
(?i)
|
Pattern.CASE_INSENSITIVE
|
(?x)
|
Pattern.COMMENTS
|
(?d)
|
Pattern.UNIX_LINES
|
---
|
Pattern.CANON_EQ (not available)
|