大约有 40,000 项符合查询结果（耗时：0.0157秒） [XML]
Regular expression to find URLs within a string
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It's 2017, and unicode domain names are all over the place. \w may not match international symbols (depends on regex engine), the range is needed instead: a-zA-Z0-9\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF.
– Michael Antipin
Aug...
How to show google.com in an iframe?
...her way is to write a simple proxy page runs on server by yourself, just request from Google and output the result to the client.
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Extracting bits with a single multiplication
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A multiplication is a bunch of shift-and-add operations. The key is to allow overflow to "shift away" the bits we don't need and put the ones we want in the right place.
Multiplication by 4 (00000100) would shift everything left by 2 and get you to a00b0000 . To get the b to move up we need to...
PostgreSQL: Show tables in PostgreSQL
...terface,
First, choose your database
\c database_name
Then, this shows all tables in the current schema:
\dt
Programmatically (or from the psql interface too, of course):
SELECT * FROM pg_catalog.pg_tables;
The system tables live in the pg_catalog database.
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How to determine the version of the C++ standard used by the compiler?
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By my knowledge there is no overall way to do this. If you look at the headers of cross platform/multiple compiler supporting libraries you'll always find a lot of defines that use compiler specific constructs to determine such things:
/*Define Microsoft V...
Converting JSON data to Java object
...ups);
}
}
Fairly simple, isn't it? Just have a suitable JavaBean and call Gson#fromJson().
See also:
Json.org - Introduction to JSON
Gson User Guide - Introduction to Gson
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form serialize javascript (no framework)
Wondering is there a function in javascript without jquery or any framework that allows me to serialize the form and access the serialized version?
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How to terminate a window in tmux?
... This works fine: Ctrl+b &, note, that you have to confirm with y to really kill the current window incluning all panes in that window. You will get be placed inside the window that you used last before that.
– rubo77
Sep 1 '16 at 5:02
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Quick unix command to display specific lines in the middle of a file?
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Or more specifically 10 lines before: grep -B 10 ... Or 10 lines after: grep -A 10 ...
– Boy Baukema
May 21 '12 at 11:14
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What is more efficient? Using pow to square or just multiply it with itself?
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I tested the performance difference between x*x*... vs pow(x,i) for small i using this code:
#include <cstdlib>
#include <cmath>
#include <boost/date_time/posix_time/posix_time.hpp>
inline boost::posix_time::ptime now()
{
return boost::posix_time::microsec_clock::local_t...