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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remove erroneous commands from ESS transcript

I'd like to better use my ESS transcript file while working on R. I know how to clean the .Rout file only keeping the command lines. But what could be great is to remove all the command lines that ...
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47 views

replace-regexp-in-string: How to prepend a string to the entire string matched?

I am adding divider lines to certain sections of the reports generated by the binary ledger [ https://www.ledger-cli.org/ ] through the function ledger-do-report in the ledger-mode Lisp library [ ...
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53 views

How can we get input using emacs?

In order to compile my lua code i use this config (defun lua-main-compile () "use lua to compile my lua code" (interactive) (compile "lua main.lua")) In my lua code ...
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39 views

How can I get the search string from incremental regexp search to use with replace regexp

If I want to do a replace-regexp I usually start with a isearch-forward-regexp so I can get immediate visual feedback on the search string. From there I'd like to grab the search string for using in ...
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44 views

Regular expressions tool example explanation

Reading the section regular expressions in EmacsWiki appears this: You can use a tool to construct regexps. For example, you can use ‘rx’ like this: (rx (or (and "\*" (*? anything) "*/&...
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What regexp gives this Imenu output?

Suppose I have the following Python script: def foo(x) -> int: y = 2 return y+x class Bar: def __init__(s): self.s = s def buz(x, y): return x*y My current Imenu ...
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41 views

Regex to replace subset of repeated pattern

ABC、DEF, GHI, JKL、MNO PQR、STU, VWX、YZ How do I replace all , s with 、 in the repeated pattern above? The repeated pattern can be mapped with the regex below: "^\\([A-Z]+、\\)\\(\\([A-Z]+\\), \\)+&...
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28 views

How can I paste a defvar into the minibuffer?

I've written a regular expression to transform Markdown links into Org Mode links and I've stored it into a variable. (defvar markdown-link-to-org-regexp "s/\[\(.+\)\](\(.+\))/[[\2][\1]]") ...
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1answer
151 views

Regex for the last line of a string

I'm trying to search for the last line in a string (lines separated by \n) using string match but I cannot make it work as intended. The code below evaluates to 0 while I would have expected 4. I ...
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2answers
28 views

Remove everything except match of regexp?

I have a file with a structure like: some text and numbers and a final number: 1.213,31 some other number 1231 and text again some text and a final number: 53,00 something else again a final number: ...
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21 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
66 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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59 views

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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23 views

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
23 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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1answer
25 views

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
35 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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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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67 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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`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
61 views

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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42 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
40 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
94 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
41 views

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
40 views

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
41 views

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
70 views

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
56 views

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
63 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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47 views

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
105 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
192 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
96 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
48 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
53 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
128 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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76 views

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
59 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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56 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
44 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
114 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
306 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
55 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
52 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
54 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
138 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
131 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
197 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
38 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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