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Javascript regex returning true.. then false.. then true.. etc [duplicate]
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/^[^-_]([a-z0-9-_]{4,20})[^-_]$/gi;
You're using a g (global) RegExp. In JavaScript, global regexen have state: you call them (with exec, test etc.) the first time, you get the first match in a given string. Call them again and ...
Git submodule update
...the submodules references (the gitlink, a special entry in the parent repo index), and you will need to add, commit and push said references from the main repo.
Next time you will clone that parent repo, it will populate the submodules to reflect those new SHA1 references.
The rest of this answer d...
Remove property for all objects in array
...the performances of your applications. You can't avoid it if you want to really remove a property but you often can either set the property to undefined or just build new objects without the property.
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Assign output of a program to a variable using a MS batch file
...e macro uses the variable like an array and stores each line in a seperate index.
In the sample of %$set% allDrives="wmic logicaldisk there will the following variables created:
allDrives.Len=5
allDrives.Max=4
allDrives[0]=Name=C:
allDrives[1]=Name=D:
allDrives[2]=Name=F:
allDrives[3]=Name=G:
all...
How do I remove a file from the FileList
...et.files);
to delete the particular element use this
newFileList.splice(index,1);
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How to order events bound with jQuery
...his.bind(eventType + eventNameSpace, eventData, handler);
var allEvents = $this.data("events") || $._data($this[0], "events");
var typeEvents = allEvents[eventType];
var newEvent = typeEvents.pop();
typeEvents.unshift(newEvent);
});
};
})(...
Difference between HashSet and HashMap?
...orial for a definitive guide: java.sun.com/docs/books/tutorial/collections/index.html
– justkt
May 5 '10 at 14:10
@jus...
把数据保存成 CSV 文件并分享出去 · App Inventor 2 中文网
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准备
拖两个文本输入框：文本输入框_项目（提示「项目」）、文本输入框_金额（提示「金额」，勾选「仅限数字」）。
拖三个按钮：按钮_记一笔、按钮_导出、按钮_导入，再拖一个标签 标签1 显示状态。
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How to write inline if statement for print?
... condition:
block
if expression (introduced in Python 2.5)
expression_if_true if condition else expression_if_false
And note, that both print a and b = a are statements. Only the a part is an expression. So if you write
print a if b else 0
it means
print (a if b else 0)
and similarly ...
实战低成本服务器搭建千万级数据采集系统 - 更多技术 - 清泛网 - 专注C/C++...
...器。到了机器后再按照天或者半天分表，比如表名为 weibo_2013020101 、weibo_2013020112。weibo_2013020101表示2月1日上午一个表，weibo_2013020112表示2月1日下午一个表。光这样分了还是不够，1000w/2=500w，经不起压力扩展。我们还需要把表再...