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.
306
questions
1
vote
1answer
31 views
Regex: Don't Match Text Between Curly Braces (LaTeX Commands)
I've been using pandoc and emacs to convert beamer presentations to markdown format. In the beamer presentations we highlighted certain code in example code blocks red. Pandoc has left me to get rid ...
3
votes
1answer
127 views
How to apply arithmetic operators to query-replace-regex
I am attempting to replace all "begin" and "dur" attribute values in my SVG code with one-tenth of (or ten times) their current values, in order to speed up/slow down animation for testing/debugging ...
1
vote
1answer
25 views
Org mode regex search view
Upon reading Search View
It state that
You can incrementally adjust a boolean search with the following keys
[ Add a positive search word
] Add a negative search word
{ Add a positive regular ...
2
votes
2answers
58 views
Grep multiple lines in a directory
I have a regular expression that can match several lines of text, and I want to use it to search every file in a directory. The problem is that standard regrep command works line by line, so this ...
6
votes
2answers
1k views
What's the idiomatic (or best) way to trim surrounding whitespace from a string?
I'm working with strings which may have any number of prefix and suffix spaces, tabs, newlines, etc. Currently I have this:
(replace-regexp-in-string
"^[^[:alnum:]]*\\(.*\\)[^[:alnum:]]*$"
"\\1" ...
1
vote
1answer
29 views
How to paste a multiline regex from re-builder into `replace-regexp`
I built with M-x re-builder a regex to match empty quoted lines in emails. In read syntax it is:
"^>\\s-*\n>"
How can I copy this regex in re-builder, so that I can paste it in the first ...
1
vote
2answers
15 views
Start by - and and by whitespace
I want to select (by regexp) only text that start by - and end by whitespace
here text:
test-hello how-are again ok
maybe good but-some not good but-what about this
I use this regexp:
-.*\s-
but ...
0
votes
1answer
24 views
Can't mark only spaces
I want to select by regexp only spaces.
Here text:
test-hello how-are again ok
maybe good but-some not good
I use regexp
[:space:]
but it's not work:
0
votes
2answers
58 views
How replace either of two words using a regexp to find them?
Text
How are you?
I'm just fine.
I need to add some suffix to the next words: are and fine.
I try this:
\(are\)|\(fine\)
but it doesn't help.
0
votes
2answers
29 views
How to chain isearch-forward-symbol-at-point and query-replace-regexp into a single keybinding?
I'm looking to create a keybinding that will perform the following shortcut:
call isearch-forward-symbol-at-point
call query-replace-regexp
It's basically a shortcut for the following key combo: M-s ...
1
vote
2answers
53 views
How can I edit my function to work to kill lines not matching RegExp [duplicate]
I made a function to filter unimportant lines from a CSS file I copied. I only want lines with the words "color" and "background" to remain in my buffer after the point the function is run. When I run ...
2
votes
1answer
39 views
Finding English Letters in a multilingual document
I have a document mainly Persian with English/French/German characters here and there. I want to append a command before Latin word(s) and a } at the end. Do you think it could be done in emacs?
...
0
votes
0answers
55 views
Regular expression to match a URL
I am trying to construct a regexp for URLs (for grabbing them out quickly out of a paragraph, region, etc.). I don't need it advanced, but I am having some troubles with it. Here is my attempt, which ...
0
votes
0answers
25 views
C++ Windows Compilation Error/Warning Regexp
I am trying to setup a compile for Emacs on Windows using the CL C++ compiler provided by Windows with Visual Studio 2017.
https://imgur.com/a/M80uTWH
as can be seen from the above image, however, ...
3
votes
1answer
31 views
pcase matches with rx but not with regex
(rx bos (1+ (in "0-2")) eos) evaluates to "\\`[0-2]+\\'", so I expected these two functions to be equivalent:
(defun with-rx (s)
(pcase s
((rx bos (1+ (in "0-2")) eos) "matched")
(t "not ...
2
votes
1answer
46 views
what does grave accent ` and aposrophe ' do in elisp regular expression?
I use C-h v to check the doc about this variable org-agenda-file-regexp.
It says it is a variable defined in ‘org.el’.
Its value is
"\\`[^.].*\\.org\\'"
What is the meaning of grave accent ` and ...
1
vote
1answer
22 views
query replace content within brackets
I was trying to re-structure my latex document but I failed to do it in a single query regex. My goal was to the following transformation:
\item[root] → \item \textbf{root}
I tied grouping the ...
1
vote
1answer
46 views
How to match an expression under the cursor?
I'm trying to match an expression under the cursor.
In this case it happens to be reStructuredText, however I don't think that's such an important detail.
:role:`Some Content`
While this works, it ...
1
vote
2answers
51 views
Emacs replace-regexp reference the match in the replace argument
Is there an easy way to use replace-regexp to do something like:
XYZ001
XYZ002
XYZ003
to
'XYZ001'
'XYZ002'
'XYZ003'
i.e. replace-regexp XYZ* 'XYZ*'
Is replace-regexp the the wrong tool for the ...
2
votes
1answer
66 views
How to correctly write regular expression to match ASCII control chars
I would like to to create a regular expression in elisp (in the standard 'read' form) to match extended ASCII chars the same as PCRE does:
^[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*$
So, I'm ...
0
votes
1answer
97 views
How to execute elisp commands
Related Question
Hi,
I want to give an elisp command which extracts the words between two arbitrary symbols. I searched google for elisp and the first item was emacs lisp, which I guess it means a ...
1
vote
1answer
45 views
Elisp expressions in projectile-replace-regexp
I need to execute a regular expression with case conversion in a entire project. If I run query-replace-regexp in a single file informing '\([A-Z]+\)' and '\,(downcase \1)', it works as expected. But ...
1
vote
1answer
71 views
search and replace double space
I've only recently started using emacs, for professional reasons.
I'm trying to replace all double spaces in a text file by single ones using regex.
In C-M-s the expression \s-\{2\} matches two spaces ...
3
votes
1answer
153 views
regexp: exclude repeated characters for highlight - hi-lock-mode
I want to search using regexp to capture plain text. I want to capture passages that begin with opening quotation marks and end at the end of the paragraph, and even though the quote continues onto a ...
2
votes
1answer
24 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
...
0
votes
1answer
48 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, ...
0
votes
1answer
25 views
1
vote
1answer
26 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 ...
5
votes
2answers
187 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 ...
0
votes
1answer
66 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 ...
1
vote
1answer
35 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 ...
5
votes
1answer
44 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 ...
1
vote
3answers
64 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
68 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 '...
6
votes
3answers
668 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 ...
1
vote
1answer
66 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?
0
votes
2answers
61 views
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?
0
votes
0answers
50 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 ...
0
votes
1answer
55 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
votes
1answer
36 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 ...
1
vote
1answer
49 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 ...
1
vote
1answer
27 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
votes
1answer
46 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
votes
1answer
708 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 ...
0
votes
0answers
17 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
votes
1answer
55 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 ...
1
vote
3answers
64 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 ...
0
votes
2answers
38 views
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
votes
1answer
46 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
votes
1answer
59 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 ...
