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Regex empty string or email
I found a lot of Regex email validation in SO but I did not find any that will accept an empty string. Is this possible through Regex only? Accepting either empty string or email only? I want to have this on Regex only.
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Purpose of returning by const value? [duplicate]
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There's nothing to optimize, const-ness is a compile-time safety mechanism.
– Paul Manta
Jan 3 '12 at 17:45
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Import error: No module name urllib2
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This worked for me. Thanks Eli. However, I am getting timeout error when I am trying to access a URL. I am also not able to ping google.com . It seems my network is using proxy.
– Vaibhav
Jun 11 '18 at 14:36
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How can I check if a scrollbar is visible?
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why you have defined same function two times? @jcubic
– Nitin S
Aug 14 '13 at 11:36
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libcurl的使用总结 - C/C++ - 清泛网 - 专注C/C++及内核技术
...刚入门的朋友指引。
一.下载安装
1.到http://curl.haxx.se/download.html上下载最新版本，由于公司的机器安装rpm有依赖关系，所以直接下载了source
2.编译。解压后进入curl的目录，直接执行 make all 就行。
3.等待编译结束后，...
git selective revert local changes from a file
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I had that error a few times if the file had been patched already, and so the interactive patch was out of date with the current file's applied patches. It happened when using a gui tool like source tree if I discarded a hunk twice accidentally. ...
Clear android application user data
Using adb shell to clear application data
7 Answers
7
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Why is semicolon allowed in this python snippet?
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It's useful for things like timeit a = 5; a*a
– endolith
May 23 '13 at 19:00
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Is it safe to use Project Lombok? [closed]
...nnoyances. The lack of a declared getter & setter can get annoying at times when you are trying to familiarize yourself with new code.
For example, if I see a method called getDynamicCols() but I don't know what it's about, I have some extra hurdles to jump to determine the purpose of this m...
Number of processors/cores in command line
I am running the following command to get the number of processors/cores in Linux:
10 Answers
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