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.

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20 views

Interactively pass argument and use regex in find replace

I have written the following code (defun krmet-replace() (interactive) (save-excursion (save-restriction ;; Narrow to the region (narrow-to-...
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1answer
46 views

org-mode: specifying a hyperlink target as regex and jumping directly to match?

The documentation of a Fortran code, being done in org-mode, is intended to be done in such a way that changing the Fortran source code to be documented should be kept at a minimum. There is the ...
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Emacs outline-mode custom heading and space between headers

I'm trying to define a structure for outline-minor-mode so I can organize my init.el conf without relying in org. So far I could not get to work with two levels of heading, I would like to have ;;; ...
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Syntax highlighting of keywords only if following builtin

I'm writing a syntax highlighting mode and am trying to highlight certain arguments, only if they are following a specific word. I've written a MWE to show my problem: (defvar mwe-builtin-list '("...
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1answer
19 views

Decode double-back-slashes-prefixed octal codes in 'utf-8

I have a string "\\303\\273" that I want to decode into û. It's known that (decode-coding-string "\303\273" 'utf-8) evals to û. However, I'm not able to translate "\\303\\273&...
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flush-lines fails in script but works when called otherwise

I'm very new to programming in Elisp so maybe the mistake is there but I'm completely stuck right now. I wanted to make a small, simple Elisp function to remove the AUTOs from my Verilog files so I ...
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1answer
26 views

Remove multiple blank lines in a buffer, leave one

I'd like to take a buffer which looks like this: one two three four five And turn it into this one two three four five I've tried using delete-blank-line, however, it will only effect the area ...
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1answer
33 views

.+$ fails to match remainder of line

This matches nothing: Query replace regexp (default \.org.+ → ): \.org.+$ → The same without '$' matches incompletely: I'd like to be able to match \.org and all that follows.
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2answers
43 views

Filter list by regexps

How can I get all elements of a list which don't match multiple patterns? The patterns are given as a list. For instance, I want all files without '("no" "nix") in them. (setq se-...
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25 views

`string-match' and `match-string' in Emacs Lisp [duplicate]

I try to understand the functions match-string and string-match in Emacs Lisp. The manual provides what seems to be (?) a reproducible example: (string-match "\\(qu\\)\\(ick\\)" ...
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3answers
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imenu to copy the target instead of jumping to it?

Is it possible to use imenu (or another package) to copy the target (specified by a regex) rather than jumping to it? This is an effort for tackling the question: How to list or autocomplete pandoc-...
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0answers
34 views

Ignoring specific files in recentf-mode by their exact filenames

I am having trouble to Ignoring specific files in recentf-mode. (add-to-list 'recentf-exclude "company-statistics-cache.el") On my end, I want to ignore them by their exact file names instead of ...
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1answer
30 views

Programmatically find-and-replace custom sequence

I need to write a command which will apply to my buffer custom, predefined copy-and-replace sequence. What I have is: (defun custom-processor () "Formats logs to human-readable format" ((replace-...
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1answer
55 views

How to search with a regexp before point?

I would like to know a function that searches a pattern located before point. re-search-backward is mentioned in the Elisp manual but I do not understand its purpose. Indeed, I do not understand the ...
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1answer
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Regexp: how to search-replace any html attribute in current buffer

Disclaimer: I'm still trying to learn elisp so I have not gotten yet to the RegExp section of the Elisp intro or Emacs manual. I would like to know how to search and replace an HTML buffer that has ...
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1answer
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thing-at-point does not bound url properly due to backslash in url

I am trying to filter URLs and elisp thing-at-point 'url doesn't bounds a url properly because it has backslashes \in it. I believe that backslashes are unsafe in urls, but that's a separate topic. ...
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1answer
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Why is the order of : and - important in a regexp character class

Defining the following function (defun windows-path-backwards () (interactive) (skip-chars-backward "a-zA-Z0-9\\\\_-:")) and running it while standing at | in the below text C:\this\path| ...
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2answers
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Not matching a character at the beginning of line

I would like to match lines that have the phrase a test but not start with >. So I want to match This is a test a test this is but not > This is a test I am not sure how to do this without ...
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1answer
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How to replace strings including `.` (dot) as first character using dired-do-find-regexp-and-replace

(defun my-find-orgfiles () (interactive) (find-name-dired "." "*py")) (global-set-key (kbd "M-n") 'my-find-orgfiles) Than, t to toggle marked/unmarked files (thus marking them all, since none ...
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1answer
40 views

search-forward-regexp with back reference

I have the following text \begin{comment} TEXT \end{comment} \begin{verbatim} TEXT \end{verbatim} and the regular expression "\\begin{\([^}]*\)} to match the \begin statements and capture the ...
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0answers
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org-table: hide grid lines

I like how org-mode allows me to quickly create and edit tables. However, I do not like the table's appearance and I would like to modify it. Customizing the face only lets me change foreground and ...
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2answers
78 views

How to get the position after matching and replacing a regular expression (replace-match)?

SHORT How to substitute (nicely) a regular expression by a string in pure elisp, like the unix command sed. LONG I'm using the function replace-match after string-match, but I can't get the right ...
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1answer
55 views

How to regex match words? (in multiple languages)

I have a simple regex search which matches [A-Za-z], however I would like it to match other characters which would be used in dictionary words for non-english languages. e.g. ü, Ø, ɵ 人参, while ...
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2answers
75 views

Check whether a string is a date in a specific format, e.g. “%Y-%m-%d”

I have a string and would like to check whether it contains a date in a given date format, e.g. "%Y-%m-%d", with format as for format-time-string. This is for a package and users can configure the ...
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1answer
44 views

How to set a variable that matches different type of strings?

I have these strings: First Type: arXiv:1234.56789 arXiv:1234.56789v1 Second type: hep-th/123456789 hep-th.AB/12345689 hep-th/123456789v1 hep-th.AB/12345689 Belong to the second type even strings ...
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1answer
47 views

can emacs memoize regexps?

This is really a question about implementation rather than anything a user of GNU Emacs would be interested in. Emacs regexps are represented as strings. There is a nice rx DSL for constructing ...
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1answer
100 views

Non-greedy regex group

This is related to my previous question over here. (replace-regexp "\\(\\[\\[\\)\\(zotero:.+\\]\\)\\(\\[.+,[《〈][^《〈]+[》〉]\\)?.+。\\(\\]\\]\\)" "\\1cite-\\2\\3\\4,頁") I'd like to use the above code ...
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2answers
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How to match first character in line after asteriks and space using regex?

For example i have lines: * test1 ** another tests * some other line I would like to match t in first line, a in second, s in third.
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1answer
51 views

what does the vertical bar “|” mean in sentence-end?

Reference to 12.1 The Regular Expression for sentence-end of Elisp introduction It illustrate alternatives of sentence-end as \\($\\| \\| \\) ^ ^^ TAB SPC and explains: Two ...
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0answers
50 views

Why is Emacs hanging or seeming like it isin an infinite loop?

In my current Emacs major-mode for Tecplot macro development, I have a few functions defined: (defconst tecplot-macro-mode-syntax-table (let ((table (make-syntax-table))) ;; ' is a string ...
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1answer
39 views

How do I build a regexp that enables Emacs to set all words to the left of an equal sign a specific font-lock-*-face?

Following some help provided by Tobias, I am trying to assign a font-lock-keyword-face to all text (:alpha:) to the left of an equal sign (=) in a new Tecplot major mode. I read through the regexp ...
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1answer
55 views

Regexp for the inverse of a match

Given a regexp A, how do I derive the inverse regexp B such that given any text exactly one of the two regexes will match it. For example in the below example: (rx (or (group ---regexpA---) ; a ...
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1answer
170 views

How to regexp-search for a word surrounded by spaces

I'm looking at this One use of regexp-quote is to combine an exact string match with context described as a regular expression. For example, this searches for the string that is the value of ...
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1answer
50 views

Query replace regexp with a distant match?

I have a single transcript file for a set of course lectures I am watching. After doing some formatting on the file. I have it broken up into sets of lessons where the main heading is the lesson title ...
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1answer
45 views

Limit font-lock highliting to first N chars of line

I write regex for font-lock and I know that the date should appear in first 40 chars of line. How can I limit search beyond some limit? I tried to add ^.\\{0,40\\}XXX but Emacs regex . is greedy ...
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1answer
43 views

Regular expression to ignore a domain in address completion

I read the manual on address autocompletion: mu4e-compose-complete-ignore-address-regexp — a regular expression to filter out other ‘junk’ e-mail addresses; defaults to "no-?reply". I am looking ...
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1answer
87 views

Counting number of matches in number of lines for regex search

I have functions that run re-search-forward and gather its output into a buffer. (defun my-search (pattern) "Uses `re-search-forward` to return matching lines." (let ((src) (rslt)) (...
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1answer
112 views

re-search-forward Regex behavior for OR boolean

We usually use \| to depict OR in Regex. Using a\|b as input to Regexp I-search and Occur both gave the desired result. But re-search-forward seems unable to recognize this notation. abcdcba (re-...
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2answers
167 views

Regexp for matching quoted strings that may have control characters in them

I am trying to use a regexp to match strings, e.g. a pattern that matches these kinds of quoted strings: "test" or 'test' or 'test with "quote"' or "test with 'quote'" This pattern matches all those,...
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1answer
31 views

How to find the next match with re-builder?

I built a complicated regular expression with re-builder and see that it works with the matches I want. How can I find all the matches, as I would with C-s in isearch-forward?
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0answers
50 views

Is point in a regexp?

I am looking for something like thing-at-point for a regexp. For example, I want a function called regexp-at-point-p that will return the matched text if the text around the point matches the regexp ...
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1answer
54 views

Can Dired query replace use regular expression to rename a group of files?

So I have long list of files that I'm trying to use regex to rename but, it looks like it does not take standard regular expressions. I’m sure I’m just doing this incorrectly. After entering dired ...
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2answers
109 views

How to match the nondirectory part of a filename with a regular expression?

Whats the correct way to match a filename from a full path using string-match-p. Say I want to check if the file is a git commit message COMMIT_EDITMSG or svn-commit.tmp or svn-commit.3.tmp to pass ...
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94 views

Regular expression for finding 'href' attribute value of <a> HTML element

I need a regex pattern for finding web page links in HTML. For example <a href="https://www.google.com/search?q=elisp+regex+lookaround" ....></a> I can use (?<=href=\").+?(?=\") | (?&...
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How to remove all console.logs() from the buffer and also how to comment all console.logs from the buffer?

When I do a regex-replace and replace with the empty string, the console.logs() are removed but the empty lines still remain. How would I remove these empty lines? Furthermore, how would I replace all ...
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2answers
623 views

Non-greedy regex not working

I can't seem to get the non-greedy regex to work. Sample String: ABCD,E《F》、《GH》、《XYIJ》、《KL》、《MN》。 Regex Code: 《.+?IJ》 Search Result: Because .+? is a non-greedy input, I was expecting the ...
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1answer
46 views

Regex search contains font-lock strings

I am searching in a buffer for a regular expression by this snippet: (setq jb-revision-version "\\([[:digit:]]+\\.?\\)") (setq jb-revision-string "\\(\\(Revision\\|Id\\): +\\)") (progn (save-...
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1answer
50 views

How to highlight digit groups of 3 in numerals?

I find it very useful to visually distinguish every 3 digit group of numbers in source code so that I can read it. For example something if I see 1000000 it is fairly easy to see that this is 1M ...
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0answers
62 views

Regex search and edit text simultaneously with multiple cursors

I'd like to search for a pattern with regex and simultaneously cut or edit all instances of that pattern. Is there a ready-made function for this? Atom, for example, has one such package - by ...
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1answer
54 views

Accessing regular expression groups outside a buffer

The code from here accesses groups of a regular expression match in a buffer in interactive mode: (let ((re (concat "\\([ \t]*" org-clock-string " *\\)" "\\([[<][^]>]+[]&...

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