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Extract substring using regexp in plain bash
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Using pure bash :
$ cat file.txt
US/Central - 10:26 PM (CST)
$ while read a b time x; do [[ $b == - ]] && echo $time; done < file.txt
another solution with bash regex :
$ [[ "US/Central - 10:26 PM (CST)" =~ -[[:space:]]*([0-9]{2}:[0-9]{2}) ]] &&
echo ${BASH_REMATCH[1]...
Multi-statement Table Valued Function vs Inline Table Valued Function
...verflow.com/questions/4109152/… Don't miss teh related document, you can read it quickly, and it's extremely interesting.
– JotaBe
May 19 '15 at 14:03
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Android: Clear Activity Stack
...ways use
Intent.FLAG_ACTIVITY_CLEAR_TOP
as a flag on that intent.
Read more about the flag here.
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Is there a recommended format for multi-line imports?
I have read there are three ways for coding multi-line imports in python
4 Answers
4
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What's the difference between and
...tancetest = aList instanceof List<? extends Object>;
for more info read Java generics and collections by Maurice Naftalin
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What is the difference between instanceof and Class.isAssignableFrom(…)?
...ference between instanceof operator and isAssignableFrom method in Class.
Read instanceof as “is this (the left part) the instance of this or any subclass of this (the right part)” and read x.getClass().isAssignableFrom(Y.class) as “Can I write X x = new Y()”. In other words, instanceof ope...
What is the fastest way to send 100,000 HTTP requests in Python?
...thon 2.6, and so far looked at the many confusing ways Python implements threading/concurrency. I have even looked at the python concurrence library, but cannot figure out how to write this program correctly. Has anyone come across a similar problem? I guess generally I need to know how to perf...
Can I update a component's props in React.js?
... information that the
component itself can change.
A good example is already provided by Valéry.
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XDocument or XmlDocument
... than streaming ones (although XStreamingElement supports lazy output). XmlReader and XmlWriter are the normal ways of streaming XML in .NET, but you can mix all the APIs to some extent. For example, you can stream a large document but use LINQ to XML by positioning an XmlReader at the start of an e...
Haskell, Lisp, and verbosity [closed]
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@JohannesGerer: I have not tried it, but as far as I have read, GHCi is not a shell into the running image, where you can redefine and extend arbitrary parts of the entire program while it is running. Also, Haskell syntax makes it much harder to copy program fragments between the r...