If you check the vim help, there is not much to explain: (`:h \@=`)

&lt;!-- language: none --&gt;

    \@=	    Matches the preceding atom with zero width. {not in Vi}
    	    Like &quot;(?=pattern)&quot; in Perl.
        	Example			    matches
        	foo$bar$\@=		&quot;foo&quot; in &quot;foobar&quot;
    	    foo$bar$\@=foo	nothing




This should match the last id:

    /id$_\d$$\@=

save some back slashes with &quot;very magic&quot;:

    /\vid(_\d$)@=

actually, it looks more straightforward to use vim&#39;s `\zs \ze`:

    id\ze_\d$

I&#39;m currently developing my first real python flask project and am about to set up the build server to deploy the &quot;Latest Build&quot; which is built on every check-in.

I have set up a startup script where I start the application using uwsgi and this part is working fine. I have recently also started using `virtualenv` and by doing so the packages installed are added to my project under `projectname\flask\Lib\site-packages`.

I&#39;m using `nginx` as the web server and the config looks like this:

    location / { try_files $uri @graderbuild; }
    location @graderbuild {
        include uwsgi_params;
        uwsgi_param UWSGI_CHDIR /usr/local/grader/build;
        uwsgi_param UWSGI_PYHOME /usr/local/grader/build;
        uwsgi_pass 127.0.0.1:3031;
    }


I&#39;m starting `uwsgi` using this:

    exec /usr/local/bin/uwsgi --master --socket 127.0.0.1:3031
        --wsgi-file restserver.py --callable app --processes 4 --die-on-term
        --threads 2 &gt;&gt; /var/log/grader-build.log 2&gt;&amp;1

Now to where I know if I&#39;m doing it right... currently I am deploying the entire folder to the build server. I don&#39;t want to install global python modules just to get my build to work. Right or wrong?

The error I get currently is:

    ImportError: No module named flask_wtf
If I&#39;m right, how do I configure the setup to use the `virtualenv` site-packages? My preferred location would be in the `startup` script and not in the `nginx` config.

How do I run uwsgi with virtualenv

We have a really big solution with more than 200 projects and thousands of files. Despite of that the solution used to load pretty quickly in Visual Studio 2010 as well as 2012. However, after copying the whole SVN repository to another location, loading and closing the solution suddenly took extreeeemly long. (I am talking about 30-60 minutes here!)

Why does it take sooo long to load my solution in Visual Studio?

I am still not so used to the vim regex syntax. I have this code:

    rename_column :keywords, :textline_two_id_4, :textline_two_id_4

I would like to match the last id with a positive lookahead in VIMs regex syntax.

How would you do this?


    \id@=_\d$

This does not work.

This perl syntax works:

    id(?=_\d$)

Edit - the answer:

    /id$_\d$$\@=

Can someone explain the syntax?



Vim positive lookahead regex

I am still not so used to the vim regex syntax. I have this code:
<pre><code class="hljs language-ruby">rename_column :keywords, :textline_two_id_4, :textline_two_id_4
</code></pre>
I would like to match the last id with a positive lookahead in VIMs regex syntax.
How would you do this?
<pre><code class="hljs language-bash">\id@=_\d$
</code></pre>
This does not work.
This perl syntax works:
<pre><code class="hljs language-ruby">id(?=_\d$)
</code></pre>
Edit - the answer:
<pre><code class="hljs language-bash">/id$_\d$$\@=
</code></pre>
Can someone explain the syntax?

I want to match a regular expression on a whole word.

In the following example I am trying to match `s` or `season` but what I have matches `s`, `e`, `a`, `o` and `n`.  

    [s|season]

How do I make a regular expression to match a whole word?


Regular expression to match a word or its prefix

I am running through lines in a text file using a `python` script.
I want to search for an `img` tag within the text document and return the tag as text.

When I run the regex `re.match(line)` it returns a  `_sre.SRE_MATCH` object.
How do I get it to return a string?

    import sys
    import string
    import re

    f = open(&quot;sample.txt&quot;, &#39;r&#39; )
    l = open(&#39;writetest.txt&#39;, &#39;w&#39;)

    count = 1

    for line in f:
        line = line.rstrip()
        imgtag  = re.match(r&#39;&lt;img.*?&gt;&#39;,line)
        print(&quot;yo it&#39;s a {}&quot;.format(imgtag))


When run it prints:

    yo it&#39;s a None
    yo it&#39;s a None
    yo it&#39;s a None
    yo it&#39;s a &lt;_sre.SRE_Match object at 0x7fd4ea90e578&gt;
    yo it&#39;s a None
    yo it&#39;s a &lt;_sre.SRE_Match object at 0x7fd4ea90e578&gt;
    yo it&#39;s a None
    yo it&#39;s a &lt;_sre.SRE_Match object at 0x7fd4ea90e578&gt;
    yo it&#39;s a &lt;_sre.SRE_Match object at 0x7fd4ea90e5e0&gt;
    yo it&#39;s a None
    yo it&#39;s a None



How do I return a string from a regex match in python?

I&#39;m writing a program where the user enters a String in the following format: 

    &quot;What is the square of 10?&quot;

 1. I need to check that there is a number in the String 
 2. and then extract just the number. 
 3. If i use `.contains(&quot;\\d+&quot;)` or `.contains(&quot;[0-9]+&quot;)`, the program can&#39;t find a number in the String, no matter what the input is, but `.matches(&quot;\\d+&quot;)`will only work when there is only numbers.

What can I use as a solution for finding and extracting?

Check and extract a number from a String in Java

I am using this regex:

    ((?:[a-z][a-z]+))_(\d+)_((?:[a-z][a-z]+)\d+)_(\d{13})

to match strings like this:

    SH_6208069141055_BC000388_20110412101855

separating into 4 groups:   

    SH
    6208069141055
    BC000388
    20110412101855

**Question:** How do I make the first group optional, so that the resulting group is a empty string?  
I want to get 4 groups in every case, when possible.

Input string for this case: (no underline after the first group)

    6208069141055_BC000388_20110412101855


Regex optional group

Part of my regex is : `/&lt;a .*?(&quot; &quot;|&quot;&quot;)(href)`. Within the `(&quot; &quot;|&quot;&quot;)`, I am trying to say match with either space or no space, but I can&#39;t get anything out of it. Ive also tried `(&quot;\s&quot;|&quot;&quot;)` with no results.

Space or no space

I&#39;ve recently found a vim plugin using something called `&lt;Plug&gt;`. For example there is a command `&lt;Plug&gt;abc_def` which I would like to execute.

I&#39;ve tried everything like `:&lt;Plug&gt;abc_def` and similar. Nothing worked. And `:help &lt;Plug&gt;` gave no information.

However, I&#39;ve been able to execute it by creating a mapping `:map x &lt;Plug&gt;(unite_redraw)`. Then I can execute it by pressing `x`.

Now, is there any way to execute `:&lt;Plug&gt;abc_def` without creating a dummy mapping just to run it? The actual plugin I use is Unite.

Execute &lt;Plug&gt; commands in vim

I am trying to disable the error bells on vim, both visual and audio. However I cannot get them to stay off.

I have the following in my `vimrc`:

    &quot; Disable annoying beeping
    set noerrorbells
    set vb t_vb=

That doesn&#39;t work, I figured some plugin or another setting was resetting it so I added it again to the end of my  `vimrc`, still no luck.

The only way I can get it to turn off is if I manually call `set vb t_vb=` after everything has loaded. I guess I could emulate this by adding a script to the `plugin/after` folder but I am trying to avoid that as it means it&#39;s another thing I have to set up whenever I switch to another machine.

You can see my full `vimrc` here: https://github.com/lerp/dotfiles/blob/master/vimrc

How to disable Vim bells sounds?

How do you select a single line in VIM, when your cursor as at some random point along that line?

I know you can do (v, $) to get to the end of the line, or (v, ^) to get to the start, but when you do (v,$,^) it logically doesn&#39;t select the whole line, it selects from cursor, until end, then switches it to cursor until beginning... So this approach fails of course.

VIM Select Entire Line

I am writing Python code using Vim, and every time I want to run my code, I type this inside Vim:

    :w !python

This gets frustrating, so I was looking for a quicker method to run Python code inside Vim. Executing Python scripts from a terminal maybe?
I am using Linux.



Running Python code in Vim

I love Vim. But its giving me hard times right now.

I use a lot of plugins and during the last 6 months, I&#39;ve found a lot of awesome ones. But my Vim got really sluggish too. I do constant cleanups, but it doesn&#39;t help much.

I&#39;m at the point, where Vim is completely unusable. It feels like it renders at 2-5 frames per second, switching tabs/buffers takes about a second, scrolling with `hjkl` is awfully terrible, the lag is so bad, even typing a sentence in insert mode is confusing (due to lag). 

*Edit: Actually, when I open fresh instance of Vim its OK-ish, but than within 15 minutes it becomes unusable.*

I&#39;ve just spent 4 hours trying to figure out which plugin or config is causing the pain. I was unsuccessful.

However, I did find out, that removal of this setting causes all the lag to go away:
`syntax on`

These 3 lines in conjunction with syntax make everything even worse.

    set t_Co=256
    set background=dark
    colorscheme candyman


Interesting. So, syntax highlighting is turning Vim from super snappy to incredibly sluggish?

I tried enabling syntax in &quot;clean&quot; mode:
`vim -u NONE`

And its not an issue there.

So what seems to be the issue is Syntax Highlighting in combination with one or more of my plugins. I tried disabling bunch, no luck.

Is there any way to do profiling? I&#39;m fairly exhausted from manual testing.

Has anyone had similar experience? Maybe take a quick peek into my `.vimrc`, see if anything rings a bell.
https://bitbucket.org/furion/dotfiles

**SOLUTION:**
The plugin causing the mess was:

    Bundle &quot;gorodinskiy/vim-coloresque.git&quot;

I recommend reading the answers tho, good insights.

**Edit (1 month later):** The coloresque plugin has seen some improvements.

Content Type	Original Author	Original Content on Stackoverflow
Question	Hendrik	View Question on Stackoverflow
Solution 1 - Regex	Kent	View Answer on Stackoverflow

Vim positive lookahead regex

Regex Problem Overview

Regex Solutions

Solution 1 - Regex

Why does it take sooo long to load my solution in Visual Studio?

How do I run uwsgi with virtualenv

Attributions