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Regular expression that matches valid IPv6 addresses
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254
I was unable to get @Factor Mystic's answer to work with POSIX regular expressions, so I wrote o...
What is the best regular expression to check if a string is a valid URL?
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415
I wrote my URL (actually IRI, internationalized) pattern to comply with RFC 3987 (http://www.f...
What is the ultimate postal code and zip regex?
...le IMO. But you would still be missing on the validation part: Zip code 12345 may exist, but 12346 not, maybe 12344 doesn't exist either. How do you check for that with a regex?
You can't.
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Validating IPv4 addresses with regexp
I've been trying to get an efficient regex for IPv4 validation, but without much luck. It seemed at one point I had had it with (25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?(\.|$)){4} , but it produces some strange results:
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LINGO使用指南 - 更多技术 - 清泛网 - 专注C/C++及内核技术
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销地
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60
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What are the differences between json and simplejson Python modules?
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394
json is simplejson, added to the stdlib. But since json was added in 2.6, simplejson has the adv...
Multiple linear regression in Python
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answered Jul 13 '12 at 22:41
djsdjs
25.8k66 gold badges8282 silver badges111111 bronze badges
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Selecting pandas column by location
...e to mind:
>>> df
A B C D
0 0.424634 1.716633 0.282734 2.086944
1 -1.325816 2.056277 2.583704 -0.776403
2 1.457809 -0.407279 -1.560583 -1.316246
3 -0.757134 -1.321025 1.325853 -2.513373
4 1.366180 -1.265185 -2.184617 0.881514
>>> df.iloc...
How do I list all versions of a gem available at a remote site?
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4 Answers
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[since C++11] std::array的使用 - C/C++ - 清泛网 - 专注C/C++及内核技术
...虚函数.
因此不支持这样的构造方法：array<int, 3> a({1, 2, 4});
初始化array最常用的方法是使用赋值运算符和初始化列表：
array<int, 3> a = {1, 2, 3};
array<int, 100> b = {1, 2, 3}; // a[0] ~ a[2] = 1, 2, 3; a[3] ~ a[99] = 0, 0, 0 ... 0;
array<int, 3> c; ...