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How to validate an Email in PHP?
...ause in fact it is a valid email address. But most of the time on the Internet, you also want the email address to have a TLD: bazmega@kapa.com. As suggested in this blog post (link posted by @Istiaque Ahmed), you can augment filter_var() with a regex that will check for the existence of a dot in th...
Use cases for NoSQL [closed]
... NoSQL), their differences and some of their use-cases: http://www.cattell.net/datastores/index.html
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foldl versus foldr behavior with infinite lists
...general overview:
Consider folding a list of n values [x1, x2, x3, x4 ... xn ] with some function f and seed z.
foldl is:
Left associative: f ( ... (f (f (f (f z x1) x2) x3) x4) ...) xn
Tail recursive: It iterates through the list, producing the value afterwards
Lazy: Nothing is evaluated until ...
How to smooth a curve in the right way?
...ab import *
def smooth_demo():
t=linspace(-4,4,100)
x=sin(t)
xn=x+randn(len(t))*0.1
y=smooth(x)
ws=31
subplot(211)
plot(ones(ws))
windows=['flat', 'hanning', 'hamming', 'bartlett', 'blackman']
hold(True)
for w in windows[1:]:
eval('plot('+w+'(ws)...
Converting list to *args when calling function [duplicate]
...itional positional arguments; if there are
positional arguments x1, ..., xN, and expression evaluates to a
sequence y1, ..., yM, this is equivalent to a call with M+N positional
arguments x1, ..., xN, y1, ..., yM.
This is also covered in the python tutorial, in a section titled Unpacking arg...
c#操作xml读取xml经过排序后再返回xml数据 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...ation("1.0 ", "GB2312 ", null);
doc.AppendChild(xdec);
foreach(XmlNode xn in arrNode)
doc.AppendChild(xn);
doc.Save("c:\\config.xml");
c# xml 读取 排序
What is the best way to ensure only one instance of a Bash script is running? [duplicate]
...() { flock -$1 $LOCKFD; }
_no_more_locking() { _lock u; _lock xn && rm -f $LOCKFILE; }
_prepare_locking() { eval "exec $LOCKFD>\"$LOCKFILE\""; trap _no_more_locking EXIT; }
# ON START
_prepare_locking
# PUBLIC
exlock_now() { _lock xn; } # obtain an exclusive lock i...
Can (domain name) subdomains have an underscore “_” in it?
...e very common in the wild. Check _jabber._tcp.gmail.com or _sip._udp.apnic.net.
Other RFC mentioned here deal with different things. The original
question was for domain names. If the question is for host
names (or for URLs, which include a host name), then this is
different, the relevant standard ...
Reducing memory usage of .NET applications?
What are some tips to reduce the memory usage of .NET applications? Consider the following simple C# program.
9 Answers
...
What's faster, SELECT DISTINCT or GROUP BY in MySQL?
...P BY is also faster than DISTINCT in AWS Redshift, because GROUP BY uses a XN HashAggregate and DISTINCT uses a XN Unique. It is the sam