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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

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 ...
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1answer
35 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, ...
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1answer
25 views

Select text on first line AND another text on third line by regexp

Suppose I has 2 jsons: { ...
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1answer
21 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 ...
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2answers
159 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 ...
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1answer
50 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 ...
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1answer
32 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 ...
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1answer
34 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 ...
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3answers
47 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
31 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 '...
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3answers
611 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 ...
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1answer
41 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?
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2answers
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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?
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0answers
46 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 ...
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1answer
46 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
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1answer
32 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 ...
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1answer
38 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 ...
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1answer
21 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
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1answer
43 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 ...
0
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1answer
143 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 ...
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0answers
16 views

Case sensitive regular expression search [duplicate]

I want to use the re-search-forward function in my Elisp code for searching text. However, it seems to ignore letter case! For instance, when I put the following in my *scratch* buffer: (re-search-...
0
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1answer
29 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 ...
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3answers
54 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 ...
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2answers
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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
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1answer
34 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
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1answer
48 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 ...
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1answer
25 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 ...
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1answer
134 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
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1answer
68 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 ...
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3answers
56 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 ...
0
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2answers
49 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
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1answer
54 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
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1answer
69 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?
2
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1answer
374 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 ...
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0answers
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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
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1answer
35 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 ...
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2answers
34 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
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1answer
39 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 ...
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vote
0answers
44 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
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1answer
42 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
209 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 ...
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vote
1answer
39 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
72 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 ...
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2answers
46 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)) ) ...
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0answers
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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 ...
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0answers
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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
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1answer
218 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
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1answer
32 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.") (...
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1answer
73 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 (...
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1answer
89 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 ‘\’ ...