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.
323
questions
1
vote
3answers
72 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
104 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
731 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 ...
1
vote
1answer
125 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
62 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
55 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
63 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
37 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
55 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
28 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
46 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 ...
2
votes
1answer
2k 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
106 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
80 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
50 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
61 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
77 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
41 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
293 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
341 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 ...
1
vote
3answers
177 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
115 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
103 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
294 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
880 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
0answers
223 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
65 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
58 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
63 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
93 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 ...
0
votes
1answer
55 views
Removing and adding newlines around expressions
I am in the process of formatting a couple of hundred markdown files and am trying to automate that process. I am having two problems, but I guess I can ask two questions ;)
Goal
I am trying to ...
3
votes
1answer
311 views
Find and remove consecutive duplicated words while ignoring case
I am trying to find and remove duplicated words in a LaTeX file.
Right now I am using query-replace-regexp with the regular expression
\b\(\w+\)[ #]+\1 where # stands for line-break (C-q C-j). This ...
1
vote
2answers
217 views
How to extract some text from within HTML code?
I have this string in an elisp variable
<br /><b>Country</b>: United States<br /><a href
I want to extract out the United States in to a separate variable.
How can I do ...
0
votes
1answer
81 views
Function that returns the name of a Greek vowel
I'm trying to write a function that will return the name of a
Greek vowel: alpha or epsilon etc. I was hoping this could be done
by extracting it from the second group in the following regexp
(in a ...
0
votes
2answers
52 views
Modify regexp in function to match only capitalized words
I have the following function
(defun fphp/find-unimported-classes ()
(interactive)
(mapcar (lambda (classentry)
(ov-clear (classentry-overlay classentry))
)
...
0
votes
0answers
61 views
Interactively matching beginning of region
Short version: If i bound the scope of a search/replace to a region in the buffer (via the second/third optional argument of search-forward and its derivates), how can i match the beginning of that ...
1
vote
0answers
29 views
JavaScript regular expressions in re-builder
Is there any package that allows me to input regular expressions following the JavaScript syntax (or even Perl Compatible Reg. Exp.)?
I want to have an interactive regular expression builder (like re-...
0
votes
1answer
632 views
Matching a literal asterisk (*) in a regexp
I am trying to write a regexp to mean:
At least one of a few punctuation marks followed by any number of blank spaces followed by a literal star is to be replaced by all those punctuation marks ...
0
votes
1answer
42 views
How to bypass lines matching some regexp, when searching forward
I've written the following function to go from an error line to the next one:
(defconst mylog-mode-error-regexp
"\\(\\[ERROR\\]\\|rule did fail\\)"
"Regexp to recognize errors in my log file.")
(...
0
votes
1answer
137 views
How to use flush-lines in a script?
I want to use flush-lines in a selected region, but I have troubles.
Here it is my code:
(defun delete-empty-lines ()
"Delete empty lines in bibliography."
(interactive)
;; set point-min
(...
1
vote
1answer
124 views
Produce \' in a string replacement
As you know, functions such as replace-regexp-in-string and replace-match have an argument LITERAL, meaning ...
If optional ... arg LITERAL is non-nil, insert NEWTEXT literally.
Otherwise treat ‘\’ ...
2
votes
0answers
254 views
How can I use more than 9 regex capture groups in Emacs Lisp?
I have to do a regexp replacement with more than 9 capture groups. How can I do it?
Here there is my code (with \\10 and \\12 that they do not work as I expected to):
(perform-replace "\\\\href{...
0
votes
1answer
105 views
Org todo list: Filter regexp
When I press C-c a M and search for a certain tag, I get a todo list of all open tasks for this specific tag.
Is it now possible to do a regular expression search similar to the sparse-tree regular ...
1
vote
1answer
155 views
Why do regexp that matches text in buffer does not (necessarily) match same text in string?
I have a regexp, org-parse-regexp which matches org items which I define to be a heading and a source block (actually, I include more stuff but I want to keep it simple). I've tested it using re-...
2
votes
1answer
141 views
Jump to and highlight characters matching regex
How can I jump to the next character matching a regex (see example below)? And if possible, enable highlighting of all the matching characters in the buffer when I jump for the first time.
[^\x20-\...
4
votes
2answers
638 views
How to toggle regex for helm/ivy user input?
IIUC, all helm commands (including helm-swoop, swiper-helm) have regex enabled by default for user input. Can we toggle/disable it by some command/shortcut? Let me know if I missed something.
Using ...
0
votes
1answer
34 views
case-fold-search apparently not taking effect in re-search-forward
I wrote the following command to do a regexp replacement in a region.
(defun camel-case-to-underscore (a b &optional use-dash)
(interactive "r")
(save-excursion
(let ((sep (if use-dash "-...
5
votes
1answer
2k views
how do I quickly remove lines from emacs buffer
In an emacs buffer when editing a file called "log/development.log"
how do I quickly remove all lines containing the word "Render"
0
votes
3answers
96 views
Help with `replace-regexp-in-string`, to replace only first instance in every line
I have the following string:
// const asdf = 'asdf'
// // comment
// const asdf2 = asdf
And I want to run a regexp replace to make it look as follows:
const asdf = 'asdf'
// comment
const asdf2 = ...
2
votes
1answer
30 views
turn coherent string into individual characters
I have a text with a number of coherent strings, e.g.:
ax923fasd
asidna1
xxa008
Is there a quick way to convert these so that there be a space between each of them, i.e.:
a x 9 2 3 f a s d
a s i d ...
