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Most efficient way to remove special characters from string

I want to remove all special characters from a string. Allowed characters are A-Z (uppercase or lowercase), numbers (0-9), underscore (_), or the dot sign (.). ...
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How do you build a Singleton in Dart?

The singleton pattern ensures only one instance of a class is ever created. How do I build this in Dart? 15 Answers ...
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Parallel.ForEach vs Task.Factory.StartNew

What is the difference between the below code snippets? Won't both be using threadpool threads? 4 Answers ...
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Web API Put Request generates an Http 405 Method Not Allowed error

Here's the call to the PUT method on my Web API - the third line in the method (I am calling the Web API from an ASP.NET MVC front end): ...
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How does BLAS get such extreme performance?

Out of curiosity I decided to benchmark my own matrix multiplication function versus the BLAS implementation... I was to say the least surprised at the result: ...
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PHP $_SERVER['HTTP_HOST'] vs. $_SERVER['SERVER_NAME'], am I understanding the man pages correctly?

I did a lot of searching and also read the PHP $_SERVER docs . Do I have this right regarding which to use for my PHP scripts for simple link definitions used throughout my site? ...
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Insert Update trigger how to determine if insert or update

I need to write an Insert, Update Trigger on table A which will delete all rows from table B whose one column (say Desc) has values like the value inserted/updated in the table A's column (say Col1). How would I go around writing it so that I can handle both Update and Insert cases. How would I dete...
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Xcode 4 says “finished running ” on the targeted device — Nothing happens

The app neither installs nor runs on my device. All provisioning profiles are up to date. I've already tried deleting and re-installing them. ...
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Custom method names in ASP.NET Web API

I'm converting from the WCF Web API to the new ASP.NET MVC 4 Web API. I have a UsersController, and I want to have a method named Authenticate. I see examples of how to do GetAll, GetOne, Post, and Delete, however what if I want to add extra methods into these services? For instance, my UsersService...
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How to copy commits from one branch to another?

I've got two branches from my master: 8 Answers 8 ...