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What exactly does the .join() method do?
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Test whether string is a valid integer
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[[ $var =~ ^-?[0-9]+$ ]]
The ^ indicates the beginning of the input pattern
The - is a literal "-"
The ? means "0 or 1 of the preceding (-)"
The + means "1 or more of the preceding ([0-9])"
The $ indicates the end of the input pattern
So...
unable to install pg gem
... latest release of pg (0.10.0) released
yesterday, but if you install 0.9.0 it
should install binaries without
issues.
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How do I query using fields inside the new PostgreSQL JSON datatype?
...ing for some docs and/or examples for the new JSON functions in PostgreSQL 9.2.
3 Answers
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How to check the version before installing a package using apt-get?
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329
OK, I found it.
apt-cache policy <package name> will show the version details.
It also sho...
How to convert a string from uppercase to lowercase in Bash? [duplicate]
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edited Oct 24 '14 at 10:19
Danny Staple
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When is a Java method name too long? [closed]
...dited Sep 12 '17 at 23:32
user719662
answered Feb 9 '10 at 17:01
JaredParJaredPar
648k...
How do I remove all non alphanumeric characters from a string except dash?
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903
Replace [^a-zA-Z0-9 -] with an empty string.
Regex rgx = new Regex("[^a-zA-Z0-9 -]");
str = r...
You have already activated rake 0.9.0, but your Gemfile requires rake 0.8.7
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C++并发编程（中文版） - 文档下载 - 清泛网 - 专注C/C++及内核技术
...持… 8
1.3.3 C++线程库的效率… 8
1.3.4 平台相关的工具… 9
1.4 开始入门… 9
1.4.1 你好，并发世界… 9
1.5 小结… 10
第2章 线程管理… 13
2.1 基本线程管理… 13
2.1.1 启动线程… 13
2.1.2 等待线程完成… 16
2.1.3 在异常环境下的等...