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How to use JavaScript regex over multiple lines?
...orkarounds
Using [^]: fastest
Using [\s\S]: 0.83% slower
Using (.|\r|\n): 96% slower
Using (.|[\r\n]): 96% slower
NB: You can also use [^] but it is deprecated in the below comment.
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impro...
What does the git index contain EXACTLY?
...ription adjusts to the recent SHA-256 work.
See commit 8afa50a, commit 0756e61, commit 123712b, commit 5b6422a (15 Aug 2020) by Martin Ågren (none).
(Merged by Junio C Hamano -- gitster -- in commit 74a395c, 19 Aug 2020)
index-format.txt: document SHA-256 index format
Signed-off-by: Martin Ågren
...
VS Debug调试模式下内存泄露检测原理 - C/C++ - 清泛网 - 专注C/C++及内核技术
...at 0x003FDAB8, 44 bytes long.
Data: < P- P- > 80 00 E4 00 50 2D E5 00 50 2D E5 00 CD CD CD CD
Object dump complete.
如果内存块号比较稳定，可以调用_CrtSetBreakAlloc，将块号作为参数设置一个断点。程序分配这个内存时将break，再查看调用堆栈。
...
HC-05/BLE 蓝牙通信数据乱码？接收到的中文乱码？乱码的原理及解决思路 · ...
...C3。而App Inventor 2的中文字符串默认是UTF-8编码的（E4 BD A0 E5 A5 BD ）。
将App Inventor 2的蓝牙客户端组件的编码改为GBK即可。
当然，将串口编码格式改为UTF-8，App Inventor 2保持默认不变也能解决乱码问题：
乱码的原理
通信过程...
Delete rows from a pandas DataFrame based on a conditional expression involving len(string) giving K
...faster than drop:
%%timeit
test = pd.DataFrame({'x': np.random.randn(int(1e6))})
test = test[test.x < 0]
# 54.5 ms ± 2.02 ms per loop (mean ± std. dev. of 7 runs, 10 loops each)
%%timeit
test = pd.DataFrame({'x': np.random.randn(int(1e6))})
test.drop(test[test.x > 0].index, inplace=True)
#...
How to automatically generate N “distinct” colors?
... """
http://en.wikipedia.org/wiki/1/2_%2B_1/4_%2B_1/8_%2B_1/16_%2B_%C2%B7_%C2%B7_%C2%B7
"""
for k in itertools.count():
yield Fraction(1,2**k)
def fracs() -> Iterable[Fraction]:
"""
[Fraction(0, 1), Fraction(1, 2), Fraction(1, 4), Fraction(3, 4), Fraction(1, 8), Fract...
How to disassemble one single function using objdump?
...0>: 55 push %rbp
0x0000000000001136 <+1>: 48 89 e5 mov %rsp,%rbp
0x0000000000001139 <+4>: 89 7d fc mov %edi,-0x4(%rbp)
4 i = i + 2;
0x000000000000113c <+7>: 83 45 fc 02 addl $0x2,-0x4(%rbp)
5 i = i *...
problem with and :after with CSS in WebKit
...='1.1' height='10px' width='15px'%3E%3Ctext x='0' y='10' fill='gray'%3E%E2%96%BE%3C/text%3E%3C/svg%3E");
background-repeat: no-repeat;
background-size: 1.5EM 1EM;
background-position: right center;
background-clip: border-box;
-moz-background-clip: border-box;
-webkit-backgro...
Approximate cost to access various caches and main memory?
... CACHE reference
71 ns - CPU cross-QPI/NUMA best case on XEON E5-46*
100 ns - MUTEX lock/unlock
100 ns - own DDR MEMORY reference
135 ns - CPU cross-QPI/NUMA best case on XEON E7-*
202 ns - CPU cross-QPI/NUMA worst case on XEON E7-*
...
How to debug Lock wait timeout exceeded on MySQL?
...x 36646234376337652d376630302d303030312d353166322d3431326132346664656366352e6d7033; asc 6db47c7e-7f00-0001-51f2-412a24fdecf5.mp3;; 7: len 21; hex 416e67656c73204e6f7720436f6e666572656e6365; asc Angels Now Conference;; 8: len 34; hex 416e67656c73204e6f7720436f6e666572656e6365204a756c7920392c203230313...