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...输入的内容时非常有用，比如一个网站如果要求你填写的QQ号必须为5位到12位数字时，可以使用：^\d{5,12}$。
这里的{5,12}和前面介绍过的{2}是类似的，只不过{2}匹配只能不多不少重复2次，{5,12}则是重复的次数不能少于5次，不能...
Given two directory trees, how can I find out which files differ by content?
...was added):
diff --brief --recursive dir1/ dir2/ # GNU long options
diff -qr dir1/ dir2/ # common short options
Should do what you need.
If you also want to see differences for files that may not exist in either directory:
diff --brief --recursive --new-file dir1/ dir2/ # GNU long options
diff ...
select and update database record with a single queryset
How do I run an update and select statements on the same queryset rather than having to do two queries:
- one to select the object
- and one to update the object
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How to find if directory exists in Python
...e is_dir() and exists() methods of a Path object can be used to answer the question:
In [1]: from pathlib import Path
In [2]: p = Path('/usr')
In [3]: p.exists()
Out[3]: True
In [4]: p.is_dir()
Out[4]: True
Paths (and strings) can be joined together with the / operator:
In [5]: q = p / 'bin' ...
RadioButton单选按钮扩展集合 · App Inventor 2 中文网
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故障排除
常见问题
Q: RadioButton不能正常工作？
A: 确保正确调用了SetLayout函数，并且CheckBox都在指定的布局中。
Q: 多个RadioButton能同时被选中？
A: 检查是否所有RadioButton都在同一个布局中，并...
How can I get the Google cache age of any URL or web page? [closed]
...
Use the URL
https://webcache.googleusercontent.com/search?q=cache:<your url without "http://">
Example:
https://webcache.googleusercontent.com/search?q=cache:stackoverflow.com
It contains a header like this:
This is Google's cache of https://stackoverflow.com/. It ...
What is the result of % in Python?
...or exception. The arguments may be floating point numbers, e.g., 3.14%0.7 equals 0.34 (since 3.14 equals 4*0.7 + 0.34.) The modulo operator always yields a result with the same sign as its second operand (or zero); the absolute value of the result is strictly smaller than the absolute value of the s...
How can I use a search engine to search for special characters? [closed]
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symbolhound.com/?q=???? <- does not work. Great project though! =)
– HyderA
Feb 1 '12 at 7:24
8
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How to extract request http headers from a request using NodeJS connect
I'd like to get the "Host" header of a request made using Node JS's connect library bundle. My code looks like:
4 Answers
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AngularJS ui-router login authentication
...s principal. It can be checked to see if the user is logged in, and upon request, it can resolve an object that represents the essential information about the user's identity. This can be whatever you need, but the essentials would be a display name, a username, possibly an email, and the roles a us...