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.
462
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How to set `org-agenda-files` depending current date in order to lessen number of files to load?
I use org-roam-dailies for my TODO lists for given day. And currently, I set my org-agenda-files to org-roam-dailies's directory as below:
(setq org-agenda-files '("~/roamnotes/daily/"))
...
- 357
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2
answers
49
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Regex to find and replace a specific character inside of multiple quoted strings in a string
Given an example string of JSON (formatted here for reading, actual input may or may not be formatted):
{
"page":1,
"per_page":6,
"total":12,
"...
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1
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23
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searching for <beginningOfLine><Comma>
how can I (interactive) search for <beginningOfLine>,
I tried ^ which means beginning of line in perl
Also \A which does signified the same in ruby.
C-s ^,
C-s \A,
I also tried search-forward-...
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44
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What is the replace regexp string for applying 3 digit grouping to any number?
the title gives it all away:
I want this
9874599842006432.08
To become this
9,874,599,842,006,432.08
with 1 single replace regexp operation and flexible,
so that the same string also would work on a ...
- 17
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3
answers
52
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How to programatically determine which alternative of a regular expression is responsible for a match?
Suppose I have a regular expression with many alternatives, such as
"[a-z]+\\|[A-Z]+\\|[0-9]+"
and it has just matched some text. I'd then like to know which of the given alternatives ...
- 767
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1
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31
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Why do Emacs Lisp regular expressions match the percentage and dollar sign as word characters?
I ran into this behavior by accident and it seems quite unusual to me.
Why do Emacs Lisp regular expressions match the percentage and dollar sign as word characters?
One theory I had was that this is ...
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2
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1
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79
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Why "looking-back" does not match "[ \n]+"?
I want to do this replacement:
\includegraphics{file
}
==>
\includegraphics{file}
I wrote this code:
(goto-char (point-min))
(while (re-search-forward "\\\\includegraphics{" nil ...
- 419
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14
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"-o" like options for `elgrep`?
Sometimes I just want the matched result by regexp instead of the whole line, this seems possible via the -o option in grep
I discovered elgrep in emacs recently, which is fantastic! Any chance we can ...
- 127
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24
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Change foreground colour or files showing error in rsync log file
I want to colour the file names that are logged with an error when using rsync.
One such file will be as follows
2022/12/07 21:33:49 [3672] WARNING: b2-infocs/unix-like/2006-hagan-gcc.pdf failed ...
- 179
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1
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46
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Using general comment character used in programming languages
I am using highlight-regexp with a regexp pattern that includes the elisp comment characters ;;. How can I extend the pattern so that it adequately handle the general comment character for each ...
- 179
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1
answer
58
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Using a sub-expression for `highlight-regexp`
I have made a face to highlight elisp comments starting with ;; [ using hi-lock. My intention is to only colour the expression [text] using SUBEXP.
(highlight-regexp "^;; \\[.+\\].+$" 'face-...
- 179
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15
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emacs multiple regex apropos
If I use apropos-command or apropos-documentation it prompts me for a word list or a regex.
In the command line, apropos allows for multiple regexes where it only shows matches that match all the ...
- 45
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1
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10
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Switch a TeX \macro and a script on a region of text
How can I search and replace in a region of a (TeX)buffer all occurences of \macro{foo}_{bar} to \macro{foo_{bar}}, foo and bar not being "constants" ?
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Weird behavior of `search-forward-regexp` influenced by buffer mode change
Action 1: evaluate the lisp expression: (search-forward-regexp "\\s'")
in a buffer in lisp-interaction-mode containing the text:
The pandemic market was cooling, but homes in north Seattle ...
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1
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32
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Highlight query-replace-regexp results while searching
I am terrible at remembering regular expression syntax. When replacing in by buffer with a regexp, I would like Emacs to highlight the possible matches while I am typing the regexp, so that I can see ...
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75
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Regexp for compilation-error-regexp-alist (react)
I try to add regexp for the compilation buffer (vite + react) for next output error:
src/pages/MainPage/MainPage.tsx:18:18 - error TS2304: Cannot find name 'SocialMedia'.
18 <...
0
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1
answer
51
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Does any package exist that can make interactive emacs-style regular expressions more readable by using font-locking?
Ideally the package would allow one to display emacs-style regular expressions, as they are entered interactively during a search and replace command, in a more human-readable form.
Perhaps fewer ...
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1
vote
1
answer
31
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regexp-isearch with fixed prefix
I'd like to search a buffer for headlines only. A headline is anything starting with the "*" character. Ideally, I'd invoke an interactive function which would take user input at the ...
- 207
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1
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20
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regexp string matching a single word
I am looking to match the word as on its own and am using
(s-replace-regexp "\\<as\\>" "s" word)
Is this the way to it?
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13
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Excluding punctuation in regexp when bounds-of-thing-at-point acts on word
I am doing (bounds-of-thing-at-point 'word) to capture words in a buffer.
(let* ( (bounds (bounds-of-thing-at-point 'word))
(word (buffer-substring (car bounds) (cdr bounds)))
I then ...
- 61
0
votes
2
answers
42
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Replacing words using multiple rules
This function is supposed to replace matches with a shortened version using multiple rules rather than just a single one. For the word counter, coun gets replaced by k, resulting in the shortened ...
- 455
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1
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34
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Using rx to insert word replacement
Been working on replacing regexps with the equivalent rx command, but the expression for rx is not producing the same result I get with the regexp. For the word counter, the regexp expression gives ...
- 455
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18
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Scheme to write shortened words according to certain rules
I want to modify words according no certain rules.
Here is a small example with three rules
a) Insert k for words with initial cog, col, com, con, cor, coun, cum.
(insert (replace-regexp-in-string &...
- 455
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0
answers
48
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Replacing single prefix from word
I want to omit the beginning of words starting with some (e.g. something changed to thing).
This is the way I am doing it
(insert (replace-regexp-in-string "\\<\\(some\\)" "" ...
- 455
0
votes
1
answer
32
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Using query-replace-regex to partially replace
I'm struggling with the basics of query-replace-regex after reading the manual.
I'm trying to replace lots of citations formatted like this:
#123213213, foo bar
to
#123213213\, foo bar
the numbers ...
- 113
0
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0
answers
37
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Extraction of reference and pdf from elfeed-entry
My elfeed is focused on finding papers and when I check out each entry, there is a PMID and DOI number at the end.
PMID:39334129 | DOI:10.1207/s12102-021-03242-8
I wanted to call a function that ...
0
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0
answers
27
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Extracting numbers from elfeed entry buffer
When I am in a particular elfeed entry buffer, I want to call a function that records the article in my .bib file by extracting the following PMID and DOI numbers from my elfeed-entry buffer:
PMID:...
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0
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28
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image-file-name-regexp: Wrong type argument: characterp
I wanted to mark certain filenames as images and added this to my config.el:
(add-to-list 'image-file-name-regexps "/preview/")
But when I run org-toggle-inline-images now, I get the ...
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1
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33
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Is it possible to mimic sed's "change line" feature?
I'd like to write an elisp function that allows me to replace any line in my buffer matching a regex pattern <PATTERN> with text <TEXT>. In other words, if line N matches <PATTERN>, ...
- 2,215
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1
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42
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Is it possible to get the line number of the nearest regex match above the current cursor position?
I'd like to write an elisp function that tells me the line number of the closest regex match above my current cursor position.
For example, if my cursor is on line 9 of the following file and my regex ...
- 2,215
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2
answers
67
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Can't find anything about spaces in the official Emacs docs [duplicate]
I want to match every string that cointains a year and a month name e.g. like that:
2022 Jul or 2022 Jul (and more spaces than 2) or even 2022Jul.
The regex I have so far is:
"\\([0-9]\\{4\\}\\)&...
- 35
2
votes
1
answer
101
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Regular expression too big
Working to create my own major mode for sqf language (arma3 scripting) I get this error:
Error during redisplay: (jit-lock-function 1) signaled (invalid-regexp "Regular expression too big")
...
- 121
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2
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46
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re-search-forward search for double and reverse quotation mark character
Good afternoon. Difficulties with creating a regular expression for this function. Interested in finding a double quotation mark or back quotation mark. Attempts at use were unsuccessful:
(re-search-...
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1
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56
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Combine two commands
To create a list from sentences in org mode, I use following command
string-insert-rectangle
replace-regexp ^ with -
How can I combine these two to form a single keyboard short-cut?
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1
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24
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regexp fails over expression involving {}
Over:
\includepdf[pages={1-}]{example-image-a.pdf}
I do / get
M-x query-replace-regexp \\includepdf[pages={1-}]{.*} → \\includepdf[pages={1-}]{TEST}
Replace 0 occurrences
The problem comes from the ...
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1
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182
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Does Emacs have some kind of interactive regular expression editor?
I mean something like https://rubular.com/ where I can enter text and experiment with regular expressions to match that text.
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4
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54
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How to match only the one word tag without the multiple word tag in image-dired?
In image-dired I use M-x image-dired-mark-tagged-files to mark files containing a tag e.g. bar (one word tag). The problem is that foo bar (multiple word tag) is marked as well.
What regex do I need ...
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1
answer
23
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What is the image-dired regexp for line-end?
In image-dired I use M-x image-dired-mark-tagged-files to mark files containing a tag using regexp. e.g. jan. The problem is that jane is marked as well.
What regex do I need to mark jan but not jane?
...
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1
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125
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How to properly use a regex for font locking
I'm stuck with a specific problem, I'm writing a major-mode for a language that supports multiple assignment, meaning that:
let s = 9
let x, y, z = 1, 2, 3
var k = 11
var a, c = 4, 5
Are all valid ...
- 269
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0
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59
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Measuring cyclomatic complexity of nested s-exp
I would like to measure the Cyclomatic Complexity on a file or a region of elisp code. By counting the maximum number of nested s-exp.
- 179
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1
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78
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Using a regexp for counting matches
I have the following function that uses a regexp for counting matches, but I have difficulty coming up with regexp expressions to test it.
(defun rk-regex-count (regex rgn-beg rgn-end)
"...
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1
vote
1
answer
34
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searching for explicit spaces, without reinterpretation
Often I'll search (an ordinary i-search) for a sequence of two spaces, or three, or four.
But on one machine I'm using, emacs by default appears to be in some mode where searches for spaces are ...
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1
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82
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How to re-search-forward OR
How can I match the values for the keys (org mode attributes) #+label OR #+name?
Example: Using get-labels () I got fig:foo. Nice.
How can I get fig:bar as well?
#+label: fig:foo
#+name: fig:bar
...
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1
vote
1
answer
67
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adding highlight to parts of a regexp
I am pretty new to emacs so please excuse the rookie question.
So I am editing a helm chart template, and have enabled yaml-mode since most of helm uses yaml.
but I wanted to add some highlighting to ...
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2
votes
1
answer
182
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How to match two consecutive identical words except for the case of the initial characters?
I'm looking for a solution to match two consecutive identical words except for the case of the initial characters with query-replace-regexp:
The the
the The
I can't figure out how to match these ...
- 419
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1
answer
41
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Compilation mode error output parse not matching
I've below code
(add-to-list 'compilation-error-regexp-alist 'kbd)
(add-to-list 'compilation-error-regexp-alist-alist
'(kbd "^kmonad: Parse error at \\([0-9]+\\):\\([0-9]+\\):" ...
- 103
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1
answer
36
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Find and recursively delete (with query) consecutive duplicate words not necessarily in the same line and/or same case
I would like to scan through a (latex) document and recursively delete -- WITH QUERY -- all consecutive, repeated words that need not be on the same line and/or the same case. Here is a simple ...
- 101
4
votes
1
answer
91
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Why is the space character not in the space category (for regexp search)?
I'm trying to get better at using Emacs regular expressions. Reading the documentation I see:
‘\cC’
matches any character that belongs to the category C. For example,
‘\cc’ matches Chinese ...
- 523
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votes
1
answer
74
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Use regex as key/car in alist
I'd like to set up an alist (similar to auto-mode-alist), which is made up from regular expressions as key (AKA car) of the list. Next I'd like to be able, to match, say the major mode, against the ...
- 363
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votes
2
answers
70
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Is this syntax parse possible with Emacs' regex expressions?
I'm trying to write a small new mode for some input files to a specific computational physics program. I'm doing it the define-derived-mode way, and was specifying the syntax highlighting by setting ...
- 113