I cannot find the way to set the find/replace function to use multiline regular expressions in spite of this github statement (2015) from the program author:
FYI I've just added support for multiline regular expressions. It's
still exclusively on my local repository but I'll push the
corresponding changeset to the online repository in the next hours.
How the UI looks like:
There is no options menu or button to select multiline, and the find/replace function is not described in the documentation as far as I know. Is it possible to use multiline regex with find/replace, or was multiline support never introduced?
Related
I'm trying to make a snippet that is triggered by a regular expression. Is it even possible in Sublime Text 3?
I've tried this but it doesn't trigger. I've already checked that sublime replaces it correctly with the Find and Replace option.
<snippet>
<content><![CDATA[$1_$2
]]></content>
<tabTrigger>([a-zA-z])(\d)</tabTrigger>
<description></description>
<scope>text.tex.latex</scope>
</snippet>
I want my snippet to be triggered by pressing tab after any word that matches a character followed by a digit and replace it with the character, a _, and the digit.
Examples
a1 turns into a_1
X0 turns into X_0
The trigger text for a sublime-snippet file has to be literal text in order to trigger; Sublime won't match it based on a regular expression. To do something like that you need a plugin command that is bound to the tab key (for example) that triggers a command that examines the text to the left of the cursor to see if it matches the regex and then expand it based on that.
I'm not aware of a general purpose package that does something like this (although Emmet does this for expanding HTML tags, it's not generic and is known to interfere with regular tab completion) but there may be one listed on package control.
This forum post on the Sublime forum includes a sample plugin that does something very similar to this that may be useful as a starting point for something like this, though. Based on your examples above, it should do what you want as long as you swap the scope in the example for the one from your snippet so that it triggeres in LaTeX files instead of Markdown. You may want to rename the command as well in that case.
[Edit] If you're not sure how to use plugin in Sublime Text, this video covers how to do it.
My guess is that, maybe this expression,
(?i)(?<=<tabTrigger>[a-z])(?=\d<\/tabTrigger>)
replaced with _ might be something that you might have in mind, for instance.
If you wish to explore/simplify/modify the expression, it's been
explained on the top right panel of
regex101.com. If you'd like, you
can also watch in this
link, how it would match
against some sample inputs.
I am using NetBeans 8.2. I am working in the code editor window and trying to use regex in combination with the NetBeans find/replace feature. I have the regex button turned on.
I am trying this
on this code
specStripWidthUpper: $("#uniflytebundle_quoteitem_QuoteRing_specStripWidthUpper"),
specStripWidthLower: $("#uniflytebundle_quoteitem_QuoteRing_specStripWidthLower"),
The result I would like would take 1st Category found in find regex
specStripWidthUpper
and repeat it on other side of colon ":" like
specStripWidthUpper:specStripWidthUpper
instead it replaces the selection with $1. looking like
specStripWidthUpper:$1,
specStripWidthLower:$1,
Is there a NetBeans setting to run regex for the replace input window or am I doing something incorrect?
Thank you in advance for your time and effort.
Netbeans (8.2?) does not like the lookarounds. I do not know if this is a new thing but you can get around it with a simplified pattern.
However, your pattern does not capture the part you want to repeat, i.e. specStripWidthUpper (you can see this when you toggle the Select option).
Try it like this:
(\w+)(?:\:)(.*),
$1:$1
You might be required to anchor the query to avoid false positives.
I'm using Visual Studio Code 1.14.2, and I'm trying to change name of variables to camelCase eg.
set_nominal_wavelength to setNominalWavelength.
Regular expression: _([a-z])
Replace: \U$1\E
does not work. Any idea how to achieve it?
As of vscode v1.75 there is a Transform to Camel Case command. So you could
Find: (_[a-z]+)+
Alt+Enter will select all those
trigger the Transform to Camel Case command
Pretty easy.
In the 1.47 Insiders Build support for the replace case modifiers (\L, \l, \U, \u) has been added to vscode. And so should be in the 1.47 stable release).
So simply doing your find: _([a-z])
and replace with \u$1 (since you only want to capitalize the first letter) works nicely in the Insiders Build now.
Works in both the Find Widget and the Search Panel.
There is a workaround:
Open Replace dialog and enter regex: _([a-z])
Then move focus to the editor area and press Ctrl+F2 ("Change All Occurrences")
Then change case of selection (Ctrl+P >upper)
Then press Left Arrow key and press Delete key
You may use other tools that support change case operators, like Notepad++, sed, R (gsub with perl=TRUE), but VS Code does not support these operators in the replacement pattern.
See this feature request on GitHub:
This is cool to have. This is beyond the scope of what is currently supported by javascript.
We need to come up with our own advanced replace engine to support these cases.
Trying to search-replace in Visual Studio Code, I find that its Regex flavor is different from full Visual Studio. Specifically, I try to declare a named group with string (?<p>[\w]+) which works in Visual Studio but not in Visual Studio Code. It'll complain with the error Invalid group.
Apart from solving this specific issue, I'm looking for information about the flavor of Regexes in Visual Studio Code and where to find documentation about it, so I can help myself with any other questions I might stumble upon.
Full Visual Studio uses .NET Regular Expressions as documented here. This link is mentioned as the documentation for VS Code elsewhere on Stackoverflow, but it's not.
Rust Regex in the Find/Replace in Files Sidebar
Rob Lourens of MSFT wrote that the file search uses Rust regex. The Rust language documentation describes the syntax.
JavaScript Regex in the Find/Replace in File Widget
Alexandru Dima of MSFT wrote that the find widget uses JavaScript regex. As Wicktor commented, ECMAScript 5's documentation describes the syntax. So does the MDN JavaScript Regular Expression Guide.
Test the Difference
The find in files sidebar does not support (?=foobar) whereas the find in file widget does support that lookahead syntax.
Regarding Find/Replace with Groups
To find/replace with groups, use parentheses () to group and $1, $2, $3, $n to replace.
Here is an example.
Before:
After:
Shaun's answer is still correct, however to add an update, recently VS Code added the option to opt into using the Perl based PCRE2 engine. You can enable this through your settings config.
This allows you to perform more advanced regex operations like lookaheads and backreferences. But as noted below, the regex still has to be valid JavaScript regex.
VS Code does support regular expression searches, however,
backreferences and lookaround aren't supported by default. But you can
enable these with the setting search.usePCRE2. This configures ripgrep
to use the PCRE2 regex engine. While PCRE2 supports many other
features, we only support regex expressions that are still valid in
JavaScript, because open editors are still searched using the editor's
JavaScript-based search.
And for a bonus if you ended up here trying to do multi line searches, VS Code recently added that feature as well!
I've found newer information (July 22, 2020) about it.
IllusionMH left the following comment in Github:
ripgrep (compatible with PCRE2) is already used for Find in files
functionality (for not open editors) and JS engine used only for open
editors.
Which regex engine does vscode use? It is now a little more nuanced than previously. The best source is this vscode wiki: Github wiki: Notes on Regular Expression Support:
[At top of document]
This document applies to search (CMD+SHIFT+F/CTRL+SHIFT+F) and
quickopen (CMD+P/CTRL+P). By default, VS Code uses the ripgrep tool to
drive search.
...
[At end of document]
Text search uses two different sets of regular expression engines. The
workspace is searched using ripgrep, which will use the Rust regex
engine, and will fallback to PCRE2 if the regex fails to parse in the
Rust regex engine. The Rust regex engine doesn't support some features
like backreferences and look-around, so if you use those features,
PCRE2 will be used. Open files are searched using a JS regex in the
editor itself. Most of the time, you don't need to worry about this,
but you may see an inconsistency in how some complex regexes are
interpreted, and this can be an explanation. Especially when you see a
regex interpreted one way when a file is open, and another way when it
is not. During a Replace operation, each file will be opened in turn,
and the search query will be run as a JS regex.
Another potential issue is how newlines are handled between ripgrep
and the editor. The editor normalizes newlines, so that you can match
both CRLF and LF line endings just with \n. It's actually not possible
to match \r explicitly in the editor because it is normalized away.
When searching in the workspace, VS Code tries to rewrite a regex so
that \n will match CRLF. But \r\n or \s\n will also match CRLF in
closed files, but not in open files.
Two key points: (1) newlines are handled specially and (2) backrefereences and look-arounds are supported despite using the Rust regex engine - if your regex has a look-around or backreference in it PCRE2 will be used instead of the Rust engine.
More on lookarounds
The Find Widget (Ctrl+F) used for finding within the active editor only supports all lookarounds (lookahead and lookbehind) and those lookarounds can be non-fixed-length. So this will work in the Find Widget: (?<!blah.*).
In a search across files (Ctrl+Shift+F) non-fixed-length lookbehinds DO NOT WORK. Lookaheads can be fixed or non-fixed-length. But non-fixed-length positive or negative lookbehinds do not work and you will get an error message below the search input box: Regex parse error: lookbehind assertion is not fixed length which may not appear until you actually try to run the search.
I'm currently creating a language with a friend and I would like to provide a highlighting for it in jEdit.
It's syntax is actually quite simple. The functions can only match this pattern:
$function_name(arguments)
Note that our parser is currently working without closing tag like the C-style semi-column and that we would like to keep this feature.
I created my jEdit mode and (almost) succeeded in highligting my pattern with <SPAN_REGEXP>. Here's how I did it:
<SPAN_REGEXP HASH_CAR="\$" TYPE="KEYWORD3" DELEGATE="ARGS">
<BEGIN>\$[A-Za_z0-9_]*\s*\(</BEGIN>
<END>)</END>
</SPAN_REGEXP>
But It's not good enough.
Here's what I would like:
Same color for the entire function skeleton : $func( )
Special highlighting (already defined within the ARGS rules set) for %content1% in $func(%content1%)
No highlighting for brackets not following a $func
Authorize alternative multiline syntax like
$func
(
args
)
which is for now not highlighted.
I guessed I needed to change my <BEGIN> regexp to accept newlines, but it seems that jEdit is unable to match multiline regexp for highlighting although he does it perfectly for search&replace !
I tried the (?s) and (?m) flags, the [\d\D]* workaround, even [\r\n]* but it never works.
So, here are my questions:
Does anyone know how to match multiline regexp in jEdit modes <SPAN_REGEXP> ?
If not, does anyone have any idea how to do what I need ?
As stated in the help, the SPAN_REGEXP does not support multi-line regexes. You can of course specify multi-line regexes, but they are only checked against individual lines and thus will then never match. You could post a Feature Request to the Feature Request Tracker of jEdit though if there is none for it yet.