It turned out that Google Chrome actually didn&#39;t support this until early 2015, [see Google Code issue][1]. With newer versions it works great, for example excluding everything that contains `banners`:

    /^(?!.*?banners)/


  [1]: https://code.google.com/p/chromium/issues/detail?can=2&amp;q=375633&amp;colspec=ID%20Pri%20M%20Iteration%20ReleaseBlock%20Cr%20Status%20Owner%20Summary%20OS%20Modified&amp;id=375633

It&#39;s possible -- at least in Chrome 58 Dev. You just need to wrap your regex with forward-slashes: `/my-regex-string/`

For example, this is one I&#39;m currently using: `/^(.(?!fallback font))+$/`

It successfully filters out any messages that contain the substring &quot;fallback font&quot;.

**EDIT**

Something else to note is that if you want to use the `^` (caret) symbol to search from the start of the log message, you have to first match the &quot;fileName.js?someUrlParam:lineNumber &quot; part of the string.

That is to say, the regex is matching against not just the log message, but also the stack-entry for the line which made the log.

So this is the regex I use to match all log messages where the actual message starts with &quot;Dog&quot;:

    /^.+?:[0-9]+ Dog/

The negative or exclusion case is much easier to write and think about when using the DevTool&#39;s native syntax. To provide the exclusion logic you need, simply use this:

    -/app/ -/some\sother\sregex/

The &quot;-&quot; prior to the regex makes the result negative.

Your expression should not contain the forward slashes and /s, these are not needed for crafting a filter.

I believe your regex should finally read:

    !(appl)
Depending on what exactly you want to filter.
The regex above will filter out all lines without the string &quot;appl&quot; in them.

edit: apparently exclusion is not supported?

I have used `rosetta.parallel.pandas_easy` to parallelize `apply` after `groupby`, for example:

    from rosetta.parallel.pandas_easy import groupby_to_series_to_frame
    df = pd.DataFrame({&#39;a&#39;: [6, 2, 2], &#39;b&#39;: [4, 5, 6]},index= [&#39;g1&#39;, &#39;g1&#39;, &#39;g2&#39;])
    groupby_to_series_to_frame(df, np.mean, n_jobs=8, use_apply=True, by=df.index)

However, has anyone figured out how to parallelize a function that returns a DataFrame? This code fails for `rosetta`, as expected.

    def tmpFunc(df):
        df[&#39;c&#39;] = df.a + df.b
        return df
    
    df.groupby(df.index).apply(tmpFunc)
    groupby_to_series_to_frame(df, tmpFunc, n_jobs=1, use_apply=True, by=df.index)


Parallelize apply after pandas groupby

When I try setting the color of a UILabel to the color of another UILabel using the code 

    myLabel.textColor = otherLabel.textColor

It doesn&#39;t change the color. When I use this code, however,

    myLabel.textColor = UIColor.redColor()

It changes the color correctly. What&#39;s the issue with the first line?

How to set textColor of UILabel in Swift

Could anyone provide an example of a regex filter for the Google Chrome Developer toolbar?

I especially need exclusion. I&#39;ve tried many regexes, but somehow they don&#39;t seem to work:

![enter image description here][1]


  [1]: http://i.stack.imgur.com/u9Ipx.png

Filter by regex example

Could anyone provide an example of a regex filter for the Google Chrome Developer toolbar?
I especially need exclusion. I've tried many regexes, but somehow they don't seem to work:
<img src="http://i.stack.imgur.com/u9Ipx.png" alt="enter image description here">

This is very much related to https://stackoverflow.com/questions/546433/regular-expression-to-match-outer-brackets however, I specifically want to know how or whether it&#39;s possible to do this [**regex&#39;s recursive pattern**](https://pypi.python.org/pypi/regex)? *I&#39;m yet to find a python example using this strategy so think this ought to be a useful question!*

I&#39;ve [seen](http://www.regular-expressions.info/recurse.html) [some](https://stackoverflow.com/a/12455760/1240268) [claims](https://stackoverflow.com/a/19122223/1240268) [that](http://www.catonmat.net/blog/recursive-regular-expressions/) recursive patterns can be used to match balanced parenthesis, but no examples using python&#39;s [regex](https://pypi.python.org/pypi/regex) package (Note: re **does not** support recursive pattern, you need to use regex).

One [claim](http://www.regular-expressions.info/recurse.html) is that syntax is `b(?:m|(?R))*e` where:

&gt; `b` is what begins the construct, `m` is what can occur in the middle of the construct, and `e` is what can occur at the end of the construct

---

I want to extract matches for the *outer* braces in the following:

    &quot;{1, {2, 3}} {4, 5}&quot;
    [&quot;1, {2, 3}&quot;, &quot;4, 5&quot;]  # desired

Note that this is easy to do the same for *inner* braces:

    re.findall(r&quot;{([^{}]*)}&quot;, &quot;{1, {2, 3}} {4, 5}&quot;)
    [&#39;2, 3&#39;, &#39;4, 5&#39;]

*(In my example I was using finditer (over match objects), see [here](https://github.com/hayd/ctox/blob/a0e8a4068c5fae5fc26dbf14d63ca4f42cc84670/ctox/subst.py#L133).)*



So I had hoped that the following, or some variation, would work:

    regex.findall(r&quot;{(:[^{}]*|?R)}&quot;, &quot;{1, {2, 3}} {4, 5}&quot;)
    regex.findall(r&quot;({(:[^{}]*|?R)})&quot;, &quot;{1, {2, 3}} {4, 5}&quot;)
    regex.findall(r&quot;({(:.*|(?R))*})&quot;, &quot;{1, {2, 3}} {4, 5}&quot;)
    regex.findall(r&quot;({(:.*)|(?R)*})&quot;, &quot;{1, {2, 3}} {4, 5}&quot;)
    regex.findall(r&quot;({(:[^{}])|(?R)})&quot;, &quot;{1, {2, 3}} {4, 5}&quot;)

but I&#39;m scuppered by either [] or `error: too much backtracking`.


**Is it possible to extract match objects for the outer parenthesis using regex&#39;s recursion?**

---

Obviously, I run the risk of being shot down with:

- [don&#39;t parse html with regex](https://stackoverflow.com/a/1732454/1240268)
- do this with pyparse
- write a proper lexer &amp; parser e.g. using ply

I want to emphasis this is about **how to use the recursive pattern** (which if my understanding is correct, takes us outside of regular language parsing, so may can actually be possible!). If it can be done, this ought to be a cleaner solution.

Recursive pattern in regex

I&#39;ve had to update my .htaccess from this:

    RewriteCond %{HTTPS} !=on
    RewriteRule ^ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]

to this:

    RewriteCond %{HTTP:X-Forwarded-Proto} !https
    RewriteRule ^ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]

to get it working behind an AWS Elasic Load Balancer. 

It all seems to work fine on AWS, but in my local environment I&#39;m stuck in a redirect loop. 

How I can get this setup to work correctly in both environments?

apache HTTP:X-Forwarded-Proto in .htaccess is causing redirect loop in dev environment

I&#39;m trying to find documents where a field starts with a value.

Table scans are disabled using [notablescan][1].

This works:

    db.articles.find({&quot;url&quot; : { $regex : /^http/ }})

This doesn&#39;t:

    db.articles.find({&quot;source.homeUrl&quot; : { $regex : /^http/ }})

I get the error:

    error: { &quot;$err&quot; : &quot;table scans not allowed:moreover.articles&quot;, &quot;code&quot; : 10111 }

There are indexes on both `url` and `source.homeUrl`:

    {
    	&quot;v&quot; : 1,
    	&quot;key&quot; : {
    		&quot;url&quot; : 1
    	},
    	&quot;ns&quot; : &quot;mydb.articles&quot;,
    	&quot;name&quot; : &quot;url_1&quot;
    }
    
    {
    	&quot;v&quot; : 1,
    	&quot;key&quot; : {
    		&quot;source.homeUrl&quot; : 1
    	},
    	&quot;ns&quot; : &quot;mydb.articles&quot;,
    	&quot;name&quot; : &quot;source.homeUrl_1&quot;,
    	&quot;background&quot; : true
    }

Are there any limitations with regex queries on subdocument indexes?

  [1]: http://docs.mongodb.org/manual/reference/parameters/#param.notablescan

Can I do a MongoDB &quot;starts with&quot; query on an indexed subdocument field?

    string = c(&quot;apple&quot;, &quot;apples&quot;, &quot;applez&quot;)
    grep(&quot;apple&quot;, string)

This would give me the index for all three elements in `string`. But I want an exact match on the word &quot;apple&quot; (i.e I just want `grep()` to return index 1).  

How to use grep()/gsub() to find exact match

I have the following problem retrieving data from MongoDB using mongoose.

Here is my Schema:


    const BookSchema = new Schema(
    	{
    		_id:Number,
    		title:String,
    		authors:[String],
    		subjects:[String]	
    	}
    );


as you can see i have 2 arrays embedded in the object, let&#39;s say the content of the authors can be something like this: authors:[&quot;Alex Ferguson&quot;, &quot;Didier Drogba&quot;, &quot;Cristiano Ronaldo&quot;, &quot;Alex&quot;]  
what I&#39;m trying to achieve is get all the Alex in the array.

So far, I&#39;ve been able to get the values if they match the value completely. However if I try to get the ones containing Alex the answer is always [].

What I want to know is how I can do this using find() without performing a map-reduce to create a view or a collection and then applying find() over that.

The code here works for exact matches


    Book.find( {authors:req.query.q} , function(errs, books){
    			if(errs){
    				res.send(errs);	
    			}
    			
    			res.json(books);
    		});

	

I tried some things but no luck 
{authors:{$elemMatch:req.query.q}}
{authors:{$in:[req.query.q]}}

This one gives me an error and on top of that says is very inefficient in another post I found here.
{$where:this.authors.indexOf(req.query.q) != -1}

and I also tried {authors:{$regex:&quot;./*value*/i&quot;}}

The map-reduce works fine, I need to make it work using the other approach to see which one is better?  

Any help is greatly appreciated. I&#39;m sure this is easy, but I&#39;m new with NodeJS and Mongo and I haven&#39;t been able to figure it out on my own.

How to get all the values that contains part of a string using mongoose find?

In Google Chrome version 38+, there&#39;s a new black ruler with Device emulation options.  Does anyone know how to disable this?

![ruler and emulation options][1]


  [1]: http://i.stack.imgur.com/cXEkQ.png

Google Chrome Developer Tools - disable black emulation options ruler

Since recent updates, Chrome DevTools now shows a useful device emulator:

![enter image description here][1]

Which is great, but **I&#39;m not emulating anything:**

 - All the options in Device are unticked
 - All the options in Media are unticked
 - All the options in Network are unselected
 - All the options in Sensors are unticked

Clicking the &#39;reset&#39; button also still shows the emulation bar.

**How can I turn  Chrome DevTools device emulator off when I am not using it?**

  [1]: http://i.stack.imgur.com/Yl2ot.png

I am not emulating mobile devices. How do I disable the Chrome DevTools device emulator?

As far as I can tell, this error was not being thrown yesterday on Chrome, and as of this morning, it is. I have not changed any of my browser settings. I have attached a screenshot (after opening/closing Developer Tools window four times):

![Failed to load resource: net::ERR_CACHE_MISS][1]

This issue is tangentially similar to Stack Overlow post *[Failed to load resource under Chrome][2]* except that it only occurs when I &quot;Inspect Element&quot; in Chrome. Here are the details I have:

To the best of my ability I undid everything I did since last night (when I did not have this error) and the error persists. When I remove all pre-`&lt;html&gt;` [PHP][3] code, the error disappears.

When I only remove all the pre-`&lt;html&gt;` PHP code except 

    &lt;?php session_start(); ?&gt;

the error returns.

Since the error seems to involve PHP, I checked my error log, but there are no notices, warnings, nor errors. When I close the Developer Tools window and then open up the window without a page reload, the number of errors increments by one each time.

When I keep the window open, and then reload the page, the page reloads without throwing the error. However, as soon as I close the Developer tools window again, then open it (no page reload), the error is thrown. I checked my site on Firefox with [Firebug][4] enabled, and no errors are thrown, making it seem like a Chrome issue (version 38). My site seems to function normally otherwise. Other sites on device browsed via Chrome (for example, Yahoo) also experience this error.

Also, I have not manually changed any of my browser settings since months ago. As an additional note, this is the **second strange error I have encountered in Chrome** in the last year (see Stack Overflow question *[Failed to load resource: net::ERR_NETWORK_IO_SUSPENDED][5]*), to which no one was able to find a solution, even with a bounty offered.

Is there a way to prevent this error, or is this a browser-only issue? On a side note, when I open up Developer Tools in Chrome for Stack&amp;nbsp;Overflow, there is no error thrown, so either Stack&amp;nbsp;Overflow is not coded in PHP or they have a way to prevent this error. I think my site is not affected, but I am not 100% sure, and it makes me nervous :)

  [1]: http://i.stack.imgur.com/PF8gF.png
  [2]: https://stackoverflow.com/questions/4390134
  [3]: http://en.wikipedia.org/wiki/PHP
  [4]: http://en.wikipedia.org/wiki/Firebug_%28software%29
  [5]: https://stackoverflow.com/questions/23725085


Bizarre Error in Chrome Developer Console - Failed to load resource: net::ERR_CACHE_MISS

Starting a couple of weeks ago....on some of our sites, but not all, when inspecting an element, the styles tab only shows the &quot;styles box&quot;, but not the actual styles relating to css?? - Again, this is **ONLY** on some sites - weird

**It should look like this** (with styles showing on the right relating to css)

![correct styles tab][1]


**BUT**......instead, on **SOME** of our sites, this just started a couple of weeks ago looking like this....with no css showing in the styles tab:

![incorrect styles tab][2]

**NOTE: it has worked for 2 years - The page looks fine and all styles are being applied to the DOM, but do NOT show up in the styles tab when inspecting element.**

Any ideas??

  [1]: http://i.stack.imgur.com/K6JIA.png
  [2]: http://i.stack.imgur.com/q5k3U.png

Google Chrome Dev Tools inspect element styles not showing

I&#39;m trying to implement long polling for the first time, and I&#39;m using XMLHttpRequest objects to do it. So far, I&#39;ve been successful at getting events in Firefox and Internet Explorer 11, but Chrome strangely is the odd one out this time.

I can load one page and it runs just fine. It makes the request right away and starts processing and displaying events. If I open the page in a second tab, one of the pages starts seeing delays in receiving events. In the dev tools window, I see multiple requests with this kind of timing:

  ![screenshot](http://i.stack.imgur.com/qFDtX.png)

&quot;Stalled&quot; will range up to 20 seconds. It won&#39;t happen on every request, but will usually happen on several requests in a row, and in one tab.

At first I thought this was an issue with my server, but then I opened two IE tabs and two Firefox tabs, and they all connect and receive the same events without stalling. Only Chrome is having this kind of trouble.

I figure this is likely an issue with the way in which I&#39;m making or serving up the request. For reference, the request headers look like this:

    Connection: keep-alive
    Last-Event-Id: 530
    User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.71 Safari/537.36
    Accept: */*
    DNT: 1
    Accept-Encoding: gzip, deflate, sdch
    Accept-Language: en-US,en;q=0.8

The response looks like this:

    HTTP/1.1 200 OK
    Cache-Control: no-cache
    Transfer-Encoding: chunked
    Content-Type: text/event-stream
    Expires: Tue, 16 Dec 2014 21:00:40 GMT
    Server: Microsoft-HTTPAPI/2.0
    Date: Tue, 16 Dec 2014 21:00:40 GMT
    Connection: close

In spite of the headers involved, I&#39;m not using the browser&#39;s native EventSource, but rather a polyfill that lets me set additional headers. The polyfill is using XMLHttpRequest under the covers, but it seems to me that no matter how the request is being made, it shouldn&#39;t stall for 20 seconds.

What might be causing Chrome to stall like this?

**Edit:** Chrome&#39;s chrome://net-internals/#events page shows that there&#39;s a timeout error involved:

    t=33627 [st=    5]      HTTP_CACHE_ADD_TO_ENTRY  [dt=20001]
                    --&gt; net_error = -409 (ERR_CACHE_LOCK_TIMEOUT)

The error message refers to a patch added to Chrome six months ago (https://codereview.chromium.org/345643003), which implements a 20-second timeout when the same resource is requested multiple times. In fact, one of the bugs the patch tries to fix ([bug number 46104](https://code.google.com/p/chromium/issues/detail?id=46104)) refers to a similar situation, and the patch is meant to *reduce* the time spent waiting.

It&#39;s possible the answer (or workaround) here is just to make the requests look different, although perhaps Chrome could respect the &quot;no-cache&quot; header I&#39;m setting.



Content Type	Original Author	Original Content on Stackoverflow
Question	kraftwer1	View Question on Stackoverflow
Solution 1 - Regex	kraftwer1	View Answer on Stackoverflow
Solution 2 - Regex	Venryx	View Answer on Stackoverflow
Solution 3 - Regex	Artif3x	View Answer on Stackoverflow
Solution 4 - Regex	aairey	View Answer on Stackoverflow

Filter by regex example

Regex Problem Overview

Regex Solutions

Solution 1 - Regex

Solution 2 - Regex

Solution 3 - Regex

Solution 4 - Regex

How to set textColor of UILabel in Swift

Parallelize apply after pandas groupby

Attributions