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How to validate an email address in PHP
...\\x23-\\x5B\\x5D-\\x7F]|(?:\\x5C[\\x00-\\x7F]))*\\x22)))*@(?:(?:(?!.*[^.]{64,})(?:(?:(?:xn--)?[a-z0-9]+(?:-+[a-z0-9]+)*\\.){1,126}){1,}(?:(?:[a-z][a-z0-9]*)|(?:(?:xn--)[a-z0-9]+))(?:-+[a-z0-9]+)*)|(?:\\[(?:(?:IPv6:(?:(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){7})|(?:(?!(?:.*[a-f0-9][:\\]]){7,})(?:[a-f0-9]{1...
C#位运算符（C#按位与、按位或 等） - 更多技术 - 清泛网 - 专注C/C++及内核技术
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a ^ b
<<
位左移运算
2
a<<4
>>
位右移运算
2
a>>2
1、位逻辑非运算
位逻辑非运算是单目的，只有一个运算对象。位逻辑非运算按位对运算对象的值进行非运算...
Regex Last occurrence?
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answered Dec 4 '11 at 11:30
stemastema
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In Java, what is the best way to determine the size of an object?
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470
You can use the java.lang.instrument package
Compile and put this class in a JAR:
import jav...
Using DISTINCT and COUNT together in a MySQL Query
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edited Sep 8 '14 at 10:19
user3414693
answered Jun 16 '09 at 15:47
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Xcode 4 - “Valid signing identity not found” error on provisioning profiles on a new Macintosh insta
I had a Macintosh I used to develop iPhone apps with using XCode 4.
I now have a new Macintosh with a new install of... everything.
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Linux command or script counting duplicated lines in a text file?
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48
Almost the same as borribles' but if you add the d param to uniq it only shows duplicates.
sor...
Difference between a “coroutine” and a “thread”?
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edited May 15 '17 at 19:24
I159
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answered De...
Get the week start date and week end date from week number
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answered Aug 12 '09 at 16:14
Robin DayRobin Day
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How do I concatenate strings in Swift?
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answered Jun 4 '14 at 9:55
FogmeisterFogmeister
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