大约有 1,100 项符合查询结果（耗时：0.0088秒） [XML]
Extract a regular expression match
...syntax and adds a few that are missing:
library(stringr)
str_locate("aaa12xxx", "[0-9]+")
# start end
# [1,] 4 5
str_extract("aaa12xxx", "[0-9]+")
# [1] "12"
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How can I add a vertical scrollbar to my div automatically?
...
You can set :
overflow-y: scroll;height: XX px
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Multiplication on command line terminal
...he trick of interpreting '5X5'
$ function calc { bc -l <<< ${@//[xX]/*}; };
$ calc 5X5
25
$ calc 5x5
25
$ calc '5*5'
25
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Logstash实践: 分布式系统的日志监控 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...Redis的队列数据结构。两者都可以用来实现系统间有序的消息异步通信。channel相比list的好处是，解除了发布者和订阅者之间的耦合。举个例子，一个Indexer在持续读取Redis中的记录，现在想加入第二个Indexer，如果使用list，就会出...
What does PermGen actually stand for?
...n is used by the JVM to hold loaded classes. You can increase it using:
-XX:MaxPermSize=384m
if you're using the Sun JVM or OpenJDK.
So if you get an OutOfMemoryException: PermGen you need to either make PermGen bigger or you might be having class loader problems.
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Count number of occurrences of a pattern in a file (even on same line)
...regex to span \n-delimited lines (if you need it).
printf 'X \n moo X\n XX\n' |
awk -vRS='X[^X]*X' 'END{print (NR<2?0:NR-1)}'
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PHP page redirect [duplicate]
...o returns a REDIRECT (302) status code to the browser unless the 201 or a 3xx status code has already been set."
– colithium
Jul 15 '10 at 22:14
4
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Clearing coverage highlighting in Eclipse
... and open it.
Click on Coverage.
To clear highlightings, click on X or XX icon as per convenience.
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What's the most appropriate HTTP status code for an “item not found” error page
... "Item not found" is usually not a success, so I don't think a 2xx status code is appropriate.
– ThiefMaster
Aug 17 at 20:35
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惨不忍睹：说一说你最穷的时候是什么样子 - 创意 - 清泛网 - 专注C/C++及内核技术
...次钱，可是发现最后还差三毛。真的是绝望透顶。
@xx君子：穷的没有女朋友注孤身，没钱找老婆
@爱Lemon的隔壁老王：大冬天穿人字拖去上班
@HeyJunez:进了救助站。
类型六：内心强大型
@谈不上最穷...