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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125 views

re-search-forward through visible text only

I have one big org file. Sometimes I only want to search for a regular expression through the visible text, not the text that is folded; otherwise my search will take much longer. How can I search ...
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2answers
68 views

What is the equivalent of “\n\t ” in string mode in re-builder?

This webpage recommends being in the string mode when using re-builder, the interactive regexp builder, where one does not have to use "\" to escape special characters. But how does one convert ...
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1answer
100 views

How to define abbrev boundaries and where to put them?

I'm new to Emacs and Common Lisp. I'm wanting to use abbrev-mode to replace standard Common Lisp function names with aliases that I have created. So for example, I would like to replace the following ...
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2answers
207 views

How can I use Regexp to rename files in Dired mode?

I've have some videos (.mp4) with subtitles files (.SRT) that I need to rename. These files have long names so I can only rename them manually. I've tried Python to rename them, but it fails. I've ...
2
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2answers
121 views

Syntax table to match arbitrary forms with regexp

I'm trying to write a small major-mode for editing pico-8 files in emacs and I had a quick question regarding best practices and matching a somewhat arbitrary form in the pico-8 cartridge files for ...
2
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2answers
1k views

Display another symbol than asterisks in org headings

I would like to change the way headings render while still using the * to type headings (so this question is distinct from Change the asterisk (heading identifier) to some other symbol in Org mode) I ...
1
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1answer
140 views

how remove all but the first n chars

How can I remove all but the first n characters of a every line in the file buffer? What I tried Mark region C-x r k #but this is cumbersome when the length of lines are very varied, and there are ...
1
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1answer
252 views

How can I match a tab not at the beginning of a line?

In Emacs, when using M-x replace-regexp, how can one specify matching a tab which is not at the beginning of a line? I know how to match a tab which is at the beginning of a line by using ^, but don't ...
12
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2answers
872 views

Incrementally replace a given string

Let us say I have a text like so below: AC(nn) AC(nn) AC(nn) AC(nn) AC(nn) AC(nn) AC(nn) AC(nn) AC(nn) AC(nn) AC(nn) Now I want to replace the nn with numbers like so AC(0) AC(1) AC(2) AC(3) AC(4)...
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1answer
209 views

Emacs Compile Mode: Extra characters before filename result in bad match

In the compile buffer of Emacs 25.3.1, I am getting the following compilation error using Clang (the error message is given as it appears in the compile buffer line by line) : src/platform/linux/...
2
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1answer
65 views

Why does ^#.*#$ not capture recursively inserted files?

While considering some refactoring, I made changes throughout a project. Halfway through the changes, and before saving, I found it doesn't quite work. I exited emacs and restarted. (That's probably ...
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0answers
42 views

How to set ps-end-cut-regexp

I often use ps-print-buffer to print out files, but I don't want the first few lines of the buffer to be printed. Here's the beginning of the buffer: # -*- mode: org; -*- # Last updated: <2017/12/...
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0answers
112 views

Prettify string, find by regex

I want to replace the regular expression `.*` by bolding .* and not displaying the backticks. So I want `elem` to become elem I looked into these questions about how to prettify strings rather than ...
3
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1answer
355 views

Find/replace in differrent file extensions

Windows 10, Emacs 25.1, Dired+, xah-find I use package xah-find for find/replace text in many files. OK. It's work. If I want to find in all java files I use the next regexp: File path regex: \.java\...
2
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1answer
166 views

highlight different regexp groups with different colors

Is there a way, that each group in regexp can be highlighted with a different color. For example, if I am searching for \(text_part_1\)\|\(text_part_2\) Can the text_part_1 be highlighted in one ...
1
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1answer
56 views

ibuffer hide beginning of lines

When I press C-x C-b I get ibuffer (installed as part of prelude I think) I like to press backtick and get the Filename/Process displayed. Another SE answer helped me with that. (ibuffer hide columns)...
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1answer
75 views

Strange regex behavior

I want to skip blank region under cursor, so I created this regex: \s+\w translated to emacs regex [:space:]+[:graph:] but it doesnt match what I want. It matches some random space somewhere! Whats ...
1
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1answer
69 views

Executing multiple replacement regexps against a string

I wanted to write a function that "auto-corrects" a string, based on a list of regular expressions and their respective replacements. I've come up with this, and it works: (setq auto-corrections-...
0
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1answer
94 views

Using result of an Elisp function as input to replace-regexp in interactive mode

I am using replace-regexp interactively. Can I programmatically refer to a match or otherwise interpolate values in the replacement string? In Ruby, for example, it is easily done, by using the #{ <...
1
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1answer
146 views

Exact match for isearch

I am relatively new to emacs. I am looking for a way to do the "exact match" type of interactive search. For example, search string "abcDEF" in following text should only match with line1's text: ...
1
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1answer
126 views

elisp replace float number with half value

I need to replace below string: (24.0000,28.0000) .. controls (27.3100,28.0000) and (29.9800,25.3100) .. (29.9800,22.0000) to: (12,14) .. controls (13.655,14) and (14.99,12.655) .. (14.99,11) The ...
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5answers
285 views

find end of string constant

I'm using a simple (re-search-forward "\"") to find the end of string constants in my buffer. This is to copy the string in a def like (defconst name1 "some string"). The problem is that string ...
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2answers
162 views

Query-replace-regexp alternative capable of handling nested braces?

TL;DR Is there some method in Emacs to replace text with nested braces/parentheses? Example I had a situation where I had to replace \dchi{ARG1}{ARG2} by \chi^{ARG2}(ARG1) For simple cases, ...
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2answers
452 views

Search through the values of all variables in Emacs

I'd like to find which variables contain a certain value. Is there a way to do a regex search through the values of every variable in Emacs?
2
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2answers
218 views

Enable mode if file content contains a matching string

I would like to enable rjsx-mode whenever a file I open contains a specific string, or a regex like import.*react for example. Is there a way to do something like this in emacs?
0
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1answer
59 views

In emacs while using M-x replace-regex, the expression matches except when i put a ^ and $ at the beginning and end. This is confusing to me!

The search query is : ([\s]*print)[^(](.*) It matches, BUT when I put ^ and $ like this : ^([\s]*print)[^(](.*)$, it doesn't. Again both work in search-forward-regex but the 2nd one does not work in ...
2
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2answers
189 views

Make flyspell avoid checking #includes in C++

Flyspell does a great job ignoring all the source code and only check comments, with one flaw: it still does check the text after #includes. So the iostream here does get highlighted: #include <...
2
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1answer
113 views

Multiple URL formats for bug-reference-mode

I’m working on a project which is version controlled using GitLab. GitLab, unlike GitHub, uses two separate URL endpoints for issues and merge requests (AKA Pull Requests): https://gitlab.example....
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1answer
205 views

elisp multiple line match string regexp

To match with multiple line regexp, I can use \\(.*\\|\n\\), but I think it should be [.*\\|\n\\] which actually doesn't work as expected. #+NAME: exam1 #+BEGIN_SRC elisp :results output (let ((str ""...
1
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2answers
131 views

Does rx macro work with underscore in character classes

I'm a little confused by the fact that underscore does not shown in the character class. ELISP> (require 'rx) rx ELISP> (rx (any "A-Z" "_")) "[A-Z_]" ELISP> (rx (any "A-z" "_")) "[A-z]" ...
7
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1answer
522 views

Is there any principal difference between “A-Z” and upper?

I just want to make sure I understood this correctly. (rx (one-or-more (any upper lower))) is equal to (rx (one-or-more (any "A-Z" "a-z"))) Correct?
1
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1answer
121 views

How to make rx.el regexps non greedy?

Here is my expression: (setq myregexp (rx bol "####" (one-or-more anything) ".")) This should match any string starting with "####", spanning ...
1
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2answers
30 views

M-x replace-regexp uppercases words in replacement text based on the first letter present in the line

So, I have the following buffer: 1234 Red blue green yellow # colors orange Now, if I run M-x replace-regexp I get odd results. If I have the search string: ^\(.+\)$ and the replacement string: ...
2
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2answers
200 views

Rx: Skip commented out lines

I'm trying to make an expression that would match the text foo if it's not on a commented out line. ;; foo ; <= not this bar ; <= not this foo ; <= this Now rx.el can exclude ...
1
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1answer
638 views

How can I make a custom font-lock keyword regex?

I'm new to emacs (spacemacs) and have been trying to get org-mode to highlight quoted strings "like this" and quoted strings 'like this'. I followed the example here, and came up with this: ;; ...
2
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2answers
2k views

Regex: Only match base.extension filenames

I would like to match all filenames with only one dot in them: (re-search-forward "[a-z0-9A-Z]?+\\.dsp$") bdsp plop.dsp.zzz plop.1.dsp plop.dsp Here, the regexp matches plop.1.dsp, but it should ...
0
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0answers
68 views

Why does looking-at ignore the *?

I seem to have some misunderstanding with looking-at. This is my test function : (defun lkat () "interactive looking at" (interactive) (if (looking-at "^\\s-*") (message "yes") (...
1
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1answer
96 views

Passing a string with substitutions to the “perform-replace” command

I want to generalize this query-replace regexp: (perform-replace "Geophysical[\s\t\n]*Research[\s\t\n]*Letters" "Geophys.\\\\ Res.\\\\ Lett." t t nil 1 nil (point-...
1
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3answers
91 views

Finding Numbers in Brackets and Summing Them

QUESTION: How can I make an emacs command M-x sum-the-brackets that scans highlighted text for all occurrences of [ <number> u ] and [ <number>u ], and sums them? EXAMPLE: Selecting ...
1
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0answers
148 views

Help Aligning a Pattern with `align-regexp`

How can I use M-x align-regexp to align by // All ; after // All , within [] after // For example: With text: Line 1 ; B // Comment 1 [11, 22] ; Comment 2 [3333, 4] Line 2 C // Comment 3 [3, 55] ...
3
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1answer
148 views

Arithmetics in a regex in a lisp function

I want to replace all hard column widths in several LaTeX-documents, e.g. replace {90mm} by {0.75\textwidth}. I already found out that you can use \, and #1 to so arithmetics on captured groups, like ...
1
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3answers
204 views

Regexp only matching one character when using abbreviations

I'm trying to expand abbreviations with some additional characters, so I'm using the regexp option on an abbrev-table to try and add these characters. The expression I used was found on this tutorial ...
3
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3answers
3k views

Regex for any file not ends with

How to write a function for finding all files in a directory which not ending with pyc and pyo? I've tried something like (find-lisp-find-files root "^(?!.*pyc$).*$") but it does not return any ...
1
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1answer
161 views

emacs align-regexp

I'm looking for a way in emacs to format a code like this: // param1, param2, param3, param4 foo(9, 8, "bar", 3) to this: // param1, param2, param3, param4 foo(9, 8, "bar", 3) I guess ...
1
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1answer
269 views

replace checkbox with glyph via font-lock

I am trying to figure out how how to replace structural elements in org-mode with glyphs/abbreviations to make them more readable. Unfortunately, I'm getting stuck on replacing a simple checkbox [X] ...
1
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1answer
403 views

regular expression whole word replace, whitespace only

Some modes treat underscores as word boundaries. I am using evil via spacemacs. I am trying to use a vim/sed style :%s/foo/bar/g search and replace, but operate only on whitespace delimited words, ...
0
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1answer
134 views

Capture text after an OR group in Emacs Lisp

Say I want to match the a character "h a" or "f a". So capture all the a that are preceded by an h or an f. I tried the following : 1) \(h\|f\) \\(a\\) but it doesn't work. the problem appears to ...
1
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1answer
227 views

sort lines by regexp

I have a todo list in a text file that I maintain with TaskAgent and emacs. TaskAgent adds trailing text to a line to indicate priority (#!!! represents highest, #! represents low, and no mark is ...
1
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2answers
646 views

Is there a way to reuse patterns in a RegExp?

Somethimes I need a RegExp which uses a complex pattern multiple times. If I copy the same pattern there it works, but this is error prone as I then need to change each occurence of the pattern ...
12
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1answer
2k views

support for regex look behind and ahead?

I need to perform regex query replace, such that foo in foo bar is matched, but foo in foo baz is not. Normally I would use regex look ahead, e.g. foo(?=bar). However, it seems like Emacs cannot do ...