大约有 1,085 项符合查询结果（耗时：0.0253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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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...
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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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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WakeLock 扩展：保持设备唤醒扩展，防止系统休眠和电池优化 · App Inventor 2 中文网
...事件响应：应用需要响应外部事件，例如响应传入的 MQTT 消息
屏幕常亮：防止屏幕变暗，例如在显示食谱时
函数
AquireFullWakeLock 获取完整唤醒锁()
获取完整的唤醒锁，保持设备完全唤醒，包括 CPU 和屏幕...
新浪是如何分析处理32亿条实时日志的？ - 更多技术 - 清泛网 - 专注C/C++及内核技术
...一个再常见不过的架构了：
（1）Kafka：接收用户日志的消息队列。
（2）Logstash：做日志解析，统一成JSON输出给Elasticsearch。
（3）Elasticsearch：实时日志分析服务的核心技术，一个schemaless，实时的数据存储服务，通过index组织...