Questions tagged [regular-expressions]
is for patterns specifying search or replace strings. Also known as `regex` or `regexp`, the patterns describe strings to match when searching or replacing. Emacs provides extensive support for `regex` patterns in many commands. Emacs also provides an interactive expression builder for such patterns.
394
questions
1
vote
2answers
142 views
How can I edit my function to work to kill lines not matching RegExp [duplicate]
I made a function to filter unimportant lines from a CSS file I copied. I only want lines with the words "color" and "background" to remain in my buffer after the point the function is run. When I run ...
2
votes
1answer
41 views
Finding English Letters in a multilingual document
I have a document mainly Persian with English/French/German characters here and there. I want to append a command before Latin word(s) and a } at the end. Do you think it could be done in emacs?
...
1
vote
0answers
195 views
Regular expression to match a URL
I am trying to construct a regexp for URLs (for grabbing them out quickly out of a paragraph, region, etc.). I don't need it advanced, but I am having some troubles with it. Here is my attempt, which ...
3
votes
1answer
110 views
pcase matches with rx but not with regex
(rx bos (1+ (in "0-2")) eos) evaluates to "\\`[0-2]+\\'", so I expected these two functions to be equivalent:
(defun with-rx (s)
(pcase s
((rx bos (1+ (in "0-2")) eos) "matched")
(t "not ...
2
votes
1answer
100 views
what does grave accent ` and aposrophe ' do in elisp regular expression?
I use C-h v to check the doc about this variable org-agenda-file-regexp.
It says it is a variable defined in org.el.
Its value is
"\\`[^.].*\\.org\\'"
What is the meaning of grave accent ` and ...
1
vote
1answer
53 views
query replace content within brackets
I was trying to re-structure my latex document but I failed to do it in a single query regex. My goal was to the following transformation:
\item[root] → \item \textbf{root}
I tied grouping the ...
1
vote
1answer
75 views
How to match an expression under the cursor?
I'm trying to match an expression under the cursor.
In this case it happens to be reStructuredText, however I don't think that's such an important detail.
:role:`Some Content`
While this works, it ...
3
votes
2answers
929 views
Emacs replace-regexp reference the match in the replace argument
Is there an easy way to use replace-regexp to do something like:
XYZ001
XYZ002
XYZ003
to
'XYZ001'
'XYZ002'
'XYZ003'
i.e. replace-regexp XYZ* 'XYZ*'
Is replace-regexp the the wrong tool for the ...
2
votes
1answer
1k views
How to correctly write regular expression to match ASCII control chars
I would like to to create a regular expression in elisp (in the standard 'read' form) to match extended ASCII chars the same as PCRE does:
^[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*$
So, I'm ...
1
vote
1answer
177 views
Elisp expressions in projectile-replace-regexp
I need to execute a regular expression with case conversion in a entire project. If I run query-replace-regexp in a single file informing '\([A-Z]+\)' and '\,(downcase \1)', it works as expected. But ...
1
vote
1answer
1k views
search and replace double space
I've only recently started using emacs, for professional reasons.
I'm trying to replace all double spaces in a text file by single ones using regex.
In C-M-s the expression \s-\{2\} matches two spaces ...
3
votes
1answer
194 views
regexp: exclude repeated characters for highlight - hi-lock-mode
I want to search using regexp to capture plain text. I want to capture passages that begin with opening quotation marks and end at the end of the paragraph, and even though the quote continues onto a ...
2
votes
1answer
62 views
How to replace a digit by a letter?
I want to replace some digits by letters such that
1 ---> a
2 ---> b
...
In emacs I have tried the following replacement:
M-x query-replace-regexp RET \([0-9]+\) RET \,(string (+ ?a \#1)) RET
...
0
votes
2answers
59 views
Regexps: 2 strings without a character in between; 2 chars w/o a string in between - Stack overflow in regexp mapper
I am trying to search through some babyl files for errors. The files are email messages that appear between ^L and ^_ (Control-L and Control-_), with a special string "\*\*\* EOOH \*\*\*" in between, ...
0
votes
1answer
30 views
2
votes
1answer
62 views
Switch from Dired to Wdired rename file and directory errors when using “-F” or “--classify” ls switch regex help
If you set -F or --classify in the dired-actual-switches then it places a / at the end of directory names and * at the end of executables. When you finish renaming the files, these characters are ...
7
votes
2answers
413 views
How to transpose two arguments of a function call for C family languages?
How to swap two arguments for C function calls? eg:
my_function(foo, bar, baz);
~~~~~~~~~~~~~^ (cursor location)
Should be transposed to the right to make:
my_function(bar, foo, baz);
The simple ...
2
votes
1answer
352 views
Replacing a string with symbols using font-lock?
I'm trying to make a font lock hook to replace strings of text for a mathmatical notation plugin.
So I'm thinking " / " (note the spaces) will turn into " ÷ ", but "/" won't. (It's a package mainly ...
1
vote
1answer
48 views
How query-replace-regexp for all text exact before specific text?
emacs 26.1, windows 10
I have some text. I need to replace all text before WARN
I use:
query-replace-regexp: .*WARN
query replace regexp: RET
But I need to delete all text BEFORE WARN.
How I can ...
5
votes
1answer
82 views
replacing regular expressions with querying on and functions on match
EDIT: gave more context for my first approach.
My goal is to search my notes for strings of the form "4/1/2014" to org-mode timestamps "<2014-04-01 Wed>" (that particular day-of-week may be ...
1
vote
3answers
166 views
How can I search a list of files for content that matches a regexp?
I am trying to write an interactive command that will search a set of files for a regexp. The files are selected programmatically, for example, as a list of files that match some date criteria, or ...
1
vote
1answer
238 views
highlight-regexp groups for syntax highlighting
I want to highlight certain words to a color using highlight-regexp. The words I want to highlight are "fn", "let", "mut", etc. for rust development.
The code I have so far is this:
(add-hook '...
6
votes
3answers
855 views
Regexp replace to match a string, but not match a superstring
Let's say I want to replace the string "Vector" by "VectorBase", but there are existing instances of "VectorBase". So I would like to omit "VectorBase". What is an elegant way to achieve this?
An ...
3
votes
1answer
266 views
How close and exit from buffer *Re-builder*?
emacs 26.1
M-x regexp-builder
Input some regexp.
Nice.
But now I want to close and exit from buffer Re-Builder. How I can do this?
0
votes
2answers
74 views
regexp-builder - no match with correct regexp. Why? [duplicate]
In buffer I has text
"ADA-SGD"
"ADT-SGD"
"ADX-SGD"
"AID-SGD"
"AMP-SGD"
"ANT-SGD"
"ARDR-SGD"
"ARK-SGD"
M-x regexp-builder
Input regexp:
"\([A-Z]+\)-\([A-Z]+\)"
But I get message:
No match.
Why?
0
votes
0answers
65 views
Has matches , but re-builder print “No matches”
Emacs 26.1
In scratch buffer I has text
KRW-EOS
hel-how
hello-how-ar
h-privet
kak-del
123-567
aaa-bbb
AAA-BBB
AAAA-BBBB
AAA-BB
AA-BBB
A-A
AAAAAAAAAA BBBBBB
AAA BBB
ZZZ-YYY
M-x regexp-builder
Input ...
0
votes
1answer
103 views
How to match a quoted symbol in a string in elisp?
I'm struggling to find a correct regexp to match quoted symbol inside a string:
" 'foo " or " 'foo.bar "
Any help will be appreciated
0
votes
1answer
47 views
How remove text before “,” (include) in every lines?
suppose I has the next text:
-1,0x0 Fireplace HD
1160,0x0 Music HD
719,1 HD
-1,1 MUSIC CHANNEL
154,1+1
-1,100% News
-1,100AutoMoto TV
I need to remove text before "," (include ,)
So the result must ...
1
vote
1answer
88 views
How do I align code on dot/period (.)?
I recently switched to emacs. Just wanted to see how it works and if it'll help with productivity.
Right now I'm working in Haskell, which means a lot of function composition with . operator.
I have ...
1
vote
1answer
38 views
Adding a line to the beginning of every function in a (ruby) source code file
Supposed I have a source code file (classes) and some methods in that file.
see
https://github.com/railstutorial/sample_app_rails_4/blob/master/app/controllers/users_controller.rb
I want to add a "...
0
votes
1answer
51 views
Emacs Regexp syntax clarification
I am a bit confused on some aspects of Emacs regexps. Specifically with the
paragraph on this page
‘\W’ matches a character which is not within a word
‘\B’ matches characters which are not a ...
3
votes
1answer
6k views
Whitespace and newlines in regexps?
For a number of reasons (one of them my lameness) I get extremely confused when it comes to whitespace and newlines in regexps.
Say for example that I want to search for an equal sign (=) followed by ...
2
votes
1answer
278 views
Tramp Unable to Recognize Remote Prompt
I have been trying to get tramp working and I am having issues with recognizing the remote prompt. Unfortunately, I cannot change the remote prompt because it is dictated by my school.
I have tried ...
1
vote
3answers
163 views
Function that does `M-x replace-regexp` or `M-x occur` with a fixed pattern and replacement strings
I often use M-x replace-regexp and M-x occur with some fixed regexp pattern and replacement string on many files.
Doing it manually by opening each file in an Emacs buffer and hitting the keys is ...
0
votes
2answers
73 views
font-lock limits ignored in anchored matchers
I think I might have found a bug in GNU Emacs but I want to check my understanding first.
In Search Based Fontification it is possible to specify a function as a matcher. It must obey the contract
...
0
votes
1answer
99 views
Advanced search and replace
I have a file, with a lot of instances of
...
fclose(f1);
fclose(f2);
fclose(f3);
...
I'd like to replace these with
...
if(fclose(f1)!=0) return 1;
if(fclose(f2)!=0) return 1;
if(fclose(f3)!=0) ...
0
votes
1answer
180 views
forward-sexp confusion
The following code is an excerpt from the elisp tutorial, section 14.6.
(while (re-search-forward "^(defun" nil t)
(setq lengths-list (cons (count-words-in-defun) lengths-list)))
Placing the ...
0
votes
1answer
55 views
What's the regex to replace <foo> with FOO?
I have a buffer with a lot of instances of words surrounded by '<' and '>', and I want to replace them all with the just capitalized word. E.g. <foo> -> FOO.
I read the regex chapter of the ...
1
vote
1answer
515 views
emacs regex to match balanced parenthesis
How can emacs lisp match balanced parenthesis? for example: "foo(bar(),hee()) out()" should be match "foo(bar(),hee())".
I try below statement but it doesn't work:
#!/usr/bin/env emacs --script
(...
0
votes
1answer
956 views
elisp regex newline escape confusion
Shown below is a simple function, which was run in the middle of a text file that contained multiple instances of repeated blank lines. The output of the function is also shown below.
The only ...
2
votes
3answers
314 views
Highlight regexp case insensitive
Is there a way to use highlight-regexp in a case-insensitive way? I'm parenthesizing an expression in my regexp and refer to it using \1 later and I want to match this regardless of case. I'm trying ...
2
votes
2answers
184 views
re-search-forward unexpected behavior: case insensitive
According to the documentation of this function, it should be case sensitive. But when I test it out, the result is case insensitive.
My emacs version is 25.3.2.
0
votes
1answer
138 views
regex to match abc = abc statement
Use emacs-lisp, how to match the same variable assign statement?
for example:
below lines should be matched:
abc = abc
xyz = xyz
weeoof = weeoof
But below lines should not be matched:
abc = abd
...
0
votes
1answer
583 views
How can I specify a regex pattern which matches only lines without a specific string? [duplicate]
How can I specify a regex pattern which matches any line without
"lecture" anywhere in it?
".pdf" at the end?
3
votes
1answer
1k views
emacs regex with multiple match for text, in multi line buffer
Following is sample text.
Header
This is test, and
mid line adsf
bag a lot of many things
shoes>
shoes/
This line should not be affected.
Neither this line.
This is test, and
mid line
bag a lot of ...
3
votes
1answer
759 views
Generate a date tree from timestamps in org-mode
Since I was interested in doing my early capture-templates, I was tempted to go with this template below:
("j" "Reference type: Journal" entry (file+headline "~/Dropbox/orgfiles/gtd/ref.org" "...
0
votes
1answer
114 views
use a function to get file in compilation-error-regexp-alist
I have used compilation-error-regexp-alist a lot so I am familiar with the syntax. However for this particular error I need to use a function to get the file because I need wildcards. Here is the ...
0
votes
2answers
90 views
Create strings of a wordlist using replace-regexp
I have a word list with a lot of words that I want to convert into a json file. To do this I need to make them strings and add a comma in the end of all words. I figured it would be nice to use ...
0
votes
1answer
96 views
Using a predefined Regex on a yank
can you please help me to write a small emacs function? This is the first lisp function I am writing and I think I am getting confused with point and mark placement.
I want to write a function that ...
1
vote
0answers
125 views
Change regex-builder-mode hook to use <C-s>
I recently discovered emacs's "regex-builder" mode and am absolutely loving it. However, there doesn't seem to be an easy way to type in an expression in the "RE-Bulider" buffer and use that ...
