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What is a non-capturing group in regular expressions?
How are non-capturing groups, i.e. (?:) , used in regular expressions and what are they good for?
15 Answers
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How to check if activity is in foreground or in visible background?
I have a splash screen on a timer. My problem is that before I finish() my activity I need to check that the next activity has started because a system dialogue box pops-up and I only want to finish() ; once the user has selected an option from the dialogue box?
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Sending Email in Android using JavaMail API without using the default/built-in app
I am trying to create a mail sending application in Android.
25 Answers
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SSL certificate rejected trying to access GitHub over HTTPS behind firewall
I'm stuck behind a firewall so have to use HTTPS to access my GitHub repository. I'm using cygwin 1.7.7 on Windows XP.
30 A...
Join strings with a delimiter only if strings are not null or empty
This feels like it should be simple, so sorry if I'm missing something here, but I'm trying to find a simple way to concatenate only non-null or non-empty strings.
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How to find out what group a given user has?
In Unix/Linux, how do you find out what group a given user is in via command line?
5 Answers
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libcurl的使用总结 - C/C++ - 清泛网 - 专注C/C++及内核技术
libcurl的使用总结最近的项目中由于要在C++代码中调用PHP的URL，所以不得不借助libcurl这个库，由于第一次用，所以很多地方很是纠结，特此写在这里，方便给同...最近的项目中由于要在C++代码中调用PHP的URL，所以不得不借助libcurl...
How do you create a random string that's suitable for a session ID in PostgreSQL?
I'd like to make a random string for use in session verification using PostgreSQL. I know I can get a random number with SELECT random() , so I tried SELECT md5(random()) , but that doesn't work. How can I do this?
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Split a collection into `n` parts with LINQ?
Is there a nice way to split a collection into n parts with LINQ?
Not necessarily evenly of course.
19 Answers
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What's the best way to get the last element of an array without deleting it?
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The many answers in this thread present us with many different options. To be able to choose from them I needed to understand their behavior and performance. In this answer I will share my findings with you, benchmarked against PHP versions 5.6.38, 7.2.10 a...