Regexp Search - Revision history

Elvince: add category

2017-06-10T11:16:43Z

add category

Procyon ember at 01:05, 22 February 2016

2016-02-22T01:05:51Z

Elvince: change category. Useless page anyway.

2014-08-28T15:53:40Z

change category. Useless page anyway.

TychoBrailleur: Formatting, and added category

2013-10-19T08:50:07Z

Formatting, and added category

1.83.84.192 at 09:54, 28 March 2012

2012-03-28T09:54:17Z

1.83.84.192: Replaced content with "C-M-s incremental forward search matching regexp C-M-r incremental backward search matching regexp"

2012-03-28T09:54:00Z

Replaced content with "C-M-s incremental forward search matching regexp C-M-r incremental backward search matching regexp"

1.83.84.192 at 09:50, 28 March 2012

2012-03-28T09:50:10Z

1.83.84.192: Created page with "== Syntax == The following characters are special : . * + ? ^ $ \ [ Between brackets [], the following are special : ] - ^ Many characters are special when they follow a ba..."

2012-03-28T09:45:56Z

Created page with "== Syntax == The following characters are special : . * + ? ^ $ \ [ Between brackets [], the following are special : ] - ^ Many characters are special when they follow a ba..."

New page

== Syntax ==

The following characters are special : . * + ? ^ $ \ [

Between brackets [], the following are special : ] - ^

Many characters are special when they follow a backslash – see below.

. any character (but newline)
* previous character or group, repeated 0 or more time
+ previous character or group, repeated 1 or more time
? previous character or group, repeated 0 or 1 time
^ start of line
$ end of line
[...] any character between brackets
[^..] any character not in the brackets
[a-z] any character between a and z
\ prevents interpretation of following special char
\| or
\w word constituent
\b word boundary
\sc character with c syntax (e.g. \s- for whitespace char)
 start\end of group
\< \> start\end of word
\` \' start\end of buffer
\1 string matched by the first group
\n string matched by the nth group
\{3\} previous character or group, repeated 3 times
\{3,\} previous character or group, repeated 3 or more times
\{3,6\} previous character or group, repeated 3 to 6 times
.?, +?, and ?? are non-greedy versions of ., +, and ?
\W, \B, and \Sc match any character that does not match \w, \b, and \sc

Characters are organized by category. Use C-u C-x = to display the category of the character under the cursor.

\ca ascii character
\Ca non-ascii character (newline included)
\cl latin character
\cg greek character
Here are some [[syntax_classes?]] that can be used between brackets, [].

[:digit:] a digit, same as [0-9]
[:upper:] a letter in uppercase
[:space:] a whitespace character, as defined by the syntax table
[:xdigit:] an hexadecimal digit
[:cntrl:] a control character
[:ascii:] an ascii character
Syntax classes:

\s- whitespace character \s/ character quote character
\sw word constituent \s$ paired delimiter
\s_ symbol constituent \s' expression prefix
\s. punctuation character \s< comment starter
\s( open delimiter character \s> comment ender
\s) close delimiter character \s! generic comment delimiter
\s" string quote character \s| generic string delimiter
\s\ escape character

== Regexp Examples ==

[-+[:digit:]] digit or + or - sign
$\+\|-$?[0-9]+$\.[0-9]+$? decimal number (-2 or 1.5 but not .2 or 1.)
$\w+$ +\1\> two consecutive, identical words
\<[[:upper:]]\w* word starting with an uppercase letter
+$ trailing whitespaces (note the starting SPC)
\w\{20,\} word with 20 letters or more
\w+phony\> word ending by phony
$19\|20$[0-9]\{2\} year 1900-2099
^.\{6,\} at least 6 symbols
^[a-zA-Z0-9_]\{3,16\}$ decent string for a user name
<tag[^> C-q C-j ]*>$.*?$</tag> html tag

== Emacs Commands that Use Regular Expressions ==

C-M-s incremental forward search matching regexp
C-M-r incremental backward search matching regexp
replace-regexp replace string matching regexp
query-replace-regexp same, but query before each replacement
align-regexp align, using strings matching regexp as delimiters
highlight-regexp highlight strings matching regexp
occur show lines containing a match
multi-occur show lines in all buffers containing a match
how-many count the number of strings matching regexp
keep-lines delete all lines except those containing matches
flush-lines delete lines containing matches
grep call unix grep command and put result in a buffer
lgrep user-friendly interface to the grep command
rgrep recursive grep
dired-do-copy-regexp copy files with names matching regexp
dired-do-rename-regexp rename files matching regexp
find-grep-dired display files containing matches for regexp with Dired

== See Also ==
[[Re-builder]] build regexp interactively in buffer

← Older revision		Revision as of 11:16, 10 June 2017
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	[[Category:Search]]		[[Category:Search]]
		+	[[Category:Buffer Navigation]]

@@ Line 1: / Line 1: @@
 # {{CommandKeys|C-M-s|isearch-forward-regexp}} : incremental forward search matching regexp
 # {{CommandKeys|C-M-r|isearch-backward-regexp}} :   incremental backward search matching regexp
 [[Category:Search]]

← Older revision		Revision as of 15:53, 28 August 2014
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	# {{CommandKeys\|C-M-r\|isearch-backward-regexp}} : incremental backward search matching regexp		# {{CommandKeys\|C-M-r\|isearch-backward-regexp}} : incremental backward search matching regexp

−	[[Category:~~Searching~~]]	+	[[Category:Search]]

← Older revision		Revision as of 08:50, 19 October 2013
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−	# C-M-s incremental forward search matching regexp	+	# {{CommandKeys\|C-M-s\|isearch-forward-regexp}} : incremental forward search matching regexp
−	# C-M-r incremental backward search matching regexp	+	# {{CommandKeys\|C-M-r\|isearch-backward-regexp}} : incremental backward search matching regexp
		+
		+	[[Category:Searching]]

← Older revision		Revision as of 09:54, 28 March 2012
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−	C-M-s incremental forward search matching regexp	+	# C-M-s incremental forward search matching regexp
−	C-M-r incremental backward search matching regexp	+	# C-M-r incremental backward search matching regexp

@@ Line 32: / Line 32: @@
 \W, \B, and \Sc match any character that does not match \w, \b, and \sc
-Characters are organized by category. Use C-u C-x = to display the category of the character under the cursor.
+=== Character category ===
    \ca      ascii character
@@ Line 38: / Line 38: @@
    \cl      latin character
    \cg      greek character
-Here are some [[syntax_classes?]] that can be used between brackets, [].
    [:digit:]  a digit, same as [0-9]
@@ Line 46: / Line 47: @@
    [:cntrl:]  a control character
    [:ascii:]  an ascii character
-Syntax classes:
    \s-   whitespace character        \s/   character quote character