Difference between revisions of "Regular expressions"
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| + | =====Search patterns===== | ||
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| + | Any of these constructs may appear anywhere in the search pattern, as long as regular expressions are turned on. | ||
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| + | :; {{string|^}} | ||
| + | :: Matches only at line beginnings. This construct does not match any specific characters, but succeeds if the matching cursor is at line beginning, and fails in all other cases. | ||
| + | :; {{string|$}} | ||
| + | :: Matches only at line ends. This construct does not match any specific characters, but succeeds if the matching cursor is at line end, and fails in all other cases. | ||
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| + | :; {{string|.}} | ||
| + | :: Matches any single character (except for newline). | ||
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| + | :; {{string|(}} | ||
| + | :: Begins a new capture group. Capture groups are useful for back-references in both search and replace patterns. | ||
| + | :; {{string|)}} | ||
| + | :: Ends current capture group. Note: Capture groups can be nested. | ||
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| + | :; {{string|<nowiki>|</nowiki>}} | ||
| + | :: Divides pattern alternations. As long as any of the alternations matches, the entire pattern matches. | ||
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| + | :; {{string|[}} | ||
| + | :: Opens character class definition. See character class definition below. | ||
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/* \\ escape for \ */ | /* \\ escape for \ */ | ||
Revision as of 12:36, 1 August 2011
Search patterns
Any of these constructs may appear anywhere in the search pattern, as long as regular expressions are turned on.
- ^
- Matches only at line beginnings. This construct does not match any specific characters, but succeeds if the matching cursor is at line beginning, and fails in all other cases.
- $
- Matches only at line ends. This construct does not match any specific characters, but succeeds if the matching cursor is at line end, and fails in all other cases.
- .
- Matches any single character (except for newline).
- (
- Begins a new capture group. Capture groups are useful for back-references in both search and replace patterns.
- )
- Ends current capture group. Note: Capture groups can be nested.
- |
- Divides pattern alternations. As long as any of the alternations matches, the entire pattern matches.
- [
- Opens character class definition. See character class definition below.
Replace patterns
Any of these constructs may appear anywhere in the replace pattern, as long as regular expressions are turned on.
- \\
- Inserts a backslash.
- \n
- Inserts a newline sequence (CR, NL or CR/NL; depends on current document options).
- \t
- Inserts a horizontal tab character (TAB).
- \f
- Inserts a form feed character (FF).
- \a
- Inserts a vell character (BEL).
- \v
- Inserts a vertical tab (VT).
- \e
- Inserts an escape character (ESC).
- \0
- Inserts a null character (NUL).
- \xhh
- Inserts a character in hex notation.
- \uhhhh
- Inserts a character in unicode notation (unicode version only).
- \cA
- Inserts a character in control notation.
- \Q ... \E
- Quoted string. Anything between \Q and \E is treated as plain-text string.
- \&
- Back-reference to the entire match.
- \1, \2, ..., \9
- Back-reference to a specific captured group.
- \+
- Back-reference to the last successfull captured group. Consider having several alternations, each with a group inside it. Only one of the alternations will match, thus only one of those groups will be valid upon replacing. This back-reference allows referencing the correct one of those groups, based on which of the alternations matched.
- Note: This can also be achieved by using branch restart groups.