Return string with first match for a regex, handling case where there is no match

I want to get the first match of a regex. In the following case, I have a list: ``` text = 'aa33bbb44' re.findall('\d+',text) # ['33', '44'] ``` I could extract the first element of the list: ``` tex...

6 Feb at 19:37

pandas equivalent of np.where

`np.where` has the semantics of a vectorized if/else (similar to Apache Spark's `when`/`otherwise` DataFrame method). I know that I can use `np.where` on `pandas.Series`, but `pandas` often defines it...

17 Feb at 08:43

Moq.Mock Exception with invocation failed with mock behavior strict

I am new to Moq framework and I have writtern a test method but I am getting the below error. I couldn't find where I have missed. Can some one please let me know how can i correct the below error? ...

26 Jul at 17:34

Is there Rx.NET for .NET Core?

Found [https://github.com/Reactive-Extensions/Rx.NET/issues/148](https://github.com/Reactive-Extensions/Rx.NET/issues/148), but I could not figure out the bottom line - where is Rx.NET for .NET Core a...

26 Jul at 00:31

Cannot implicitly convert type 'System.Collections.Generic.List<>' to 'System.Threading.Tasks.Task<>>

I am getting an exception. > Cannot implicitly convert type `'System.Collections.Generic.List<IntegraPay.Domain.SObjects.Industry>'` to `'System.Threading.Tasks.Task<System.Collections.Generic.IEnum...

26 Jul at 00:37

Connect to SQL Server database from a docker container

I have docker for windows installed on my machine. There is a console application targeting .net core 1.0.0 that tries to access a SQL Server database running on a different VM. I can ping the VM runn...

9 Oct at 11:44

ASP.NET Core - The name 'JsonRequestBehavior' does not exist in the current context

In my ASP.NET Core (.NET Framework) project, I'm getting above error on my following Controller Action method. What I may be missing? Or, are there any work arounds?: ``` public class ClientController...

Run react-native on android emulator

I try to run react-native app on genymotion android emulator on my mac. When I write `react-native run-android` It gets ``` Running /usr/local/opt/android-sdk/platform-tools/adb reverse tcp:8081 tcp...

How do I launch the web browser after starting my ASP.NET Core application?

I have a ASP.NET Core application that will be used as a client by multiple users. In other words, it will not be hosted on a central server and they will run the published executable anytime they ne...

7 Aug at 00:22

Why does this method return double.PositiveInfinity not DivideByZeroException?

I ran the following snippet in the VS2015 C# interactive and got some very weird behavior. ``` > double divide(double a, double b) . { . try . { . return a / b; . } . catch (D...

How to execute a Bash command only if a Docker container with a given name does not exist?

On a Jenkins machine I would like to create a docker container with a specified name only if it does not already exist (in a shell script). I thought I might run the command to create the container re...

28 Oct at 18:7

How to search for text in all files in a directory?

Is there a way to search for text in all files in a directory using VS Code? I.e., if I type `find this` in my search, it will search through all the files in the current directory and return the file...

10 Mar at 20:44

How to detect when an @Input() value changes in Angular?

I have a parent component (), a child component () and an ApiService. I have most of this working fine i.e. each component can access the json api and get its relevant data via observables. Currentl...

In ServiceStack, how do I broadcast messages from the Server?

Is there a simple tutorial showing how to use Server Events with ServiceStack? Specifically, I'm looking for a way to have a server generate messages to be broadcast to all clients. I've been readin...

25 Jul at 14:56

How to get HttpContext.Current in ASP.NET Core?

We are currently rewriting/converting our ASP.NET WebForms application using ASP.NET Core. Trying to avoid re-engineering as much as possible. There is a section where we use `HttpContext` in a class...

15 Jun at 04:0

How to determine if .NET Core is installed

I know that for older versions of .NET, you can determine if a given version is installed by following ``` https://support.microsoft.com/en-us/kb/318785 ``` Is there an official method of determin...

31 Jan at 13:24

tap detection on a gameobject in unity

i'm currently making a soccer game. In this mini-game, when the player touch the ball, it adds force, and the goal is to make the higher score. So i wrote: ``` void Update() { if(Input.touchCou...

25 Jul at 11:11

Change drive in git bash for windows

I was trying to navigate to my drive location `E:/Study/Codes` in `git bash` in windows. In command prompt in order to change drive I use `E:` It returns an error in `git bash`. > bash: E:: command ...

5 May at 03:1

Maximum http request size for asp web.api with json

I have web api project. I need to post there json data with file as encoded base64 string (up to 200 mb). If i send data up to about 10 mb, then next method normally get properly filled model Import...

25 Jul at 09:12

Force IEnumerable<T> to evaluate without calling .ToArray() or .ToList()

If I query EF using something like this... ``` IEnumerable<FooBar> fooBars = db.FooBars.Where(o => o.SomeValue == something); ``` IIRC, This creates a lazy-evaluated, iterable state machine in the ...

Getting inappropriate output with left join

I am trying to get list of variants and for each of this variants get all `subvariants list` irrespective of where subvariants fall for particular `Test say 100`.This is sample data: ``` Id Test...

1 Aug at 18:57

How to get current available GPUs in tensorflow?

I have a plan to use distributed TensorFlow, and I saw TensorFlow can use GPUs for training and testing. In a cluster environment, each machine could have 0 or 1 or more GPUs, and I want to run my Ten...

26 Jul at 02:37

Node.js heap out of memory

Today I ran my script for filesystem indexing to refresh RAID files index and after 4h it crashed with following error: ``` [md5:] 241613/241627 97.5% [md5:] 241614/241627 97.5% [md5:] 241625/...

JContainer, JObject, JToken and Linq confusion

I am having trouble understanding when to use `JContainer`, `JObject`, and `JToken`. I understand from the "standards" that `JObject` is composed of `JProperties` and that `JToken` is the base abstrac...

3 Apr at 07:21

How are Equals and GetHashCode implemented on anonymous types?

The Help says this: > Anonymous types are class types that derive directly from object, and that cannot be cast to any type except object. The compiler provides a name for each anonymous type, al...

25 Jul at 02:11