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Add UIPickerView & a Button in Action sheet - How?
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edited May 23 '17 at 12:30
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answered Oct 2 '13 at 3:09
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正则表达式 30 分钟入门教程 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...后是一个连字号“-”，最后是7或8位数字的字符串(像010-12345678或0376-7654321)。
入门
学习正则表达式的最好方法是从例子开始，理解例子之后再自己对例子进行修改，实验。下面给出了不少简单的例子，并对它们作了详细的说明...
How to convert a unix timestamp (seconds since epoch) to Ruby DateTime?
... must be converted to a string:
require 'date'
DateTime.strptime("1318996912",'%s')
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Get MD5 hash of big files in Python
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Break the file into 8192-byte chunks (or some other multiple of 128 bytes) and feed them to MD5 consecutively using update().
This takes advantage of the fact that MD5 has 128-byte digest blocks (8192 is 128×64). Since you're not reading the entire file into memory, this won't use much ...
Long press on UITableView
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– user467105
Oct 18 '10 at 15:12
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Don't forget, gesture recognizers can now be added to UI...
OSX - How to auto Close Terminal window after the “exit” command executed.
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Most efficient way to concatenate strings?
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StringBuilder has a huge comparable start-up cost, it's only efficient when used with very large strings, or very many concatenations. It i...
How do I read all classes from a Java package in the classpath?
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Peter Mortensen
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answered Mar 17 '11 at 19:05
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How to find all occurrences of a substring?
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David Leon
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answered Jan 12 '11 at 2:43
moinudinmoinudin
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Is there an MD5 Fixed Point where md5(x) == x?
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Since an MD5 sum is 128 bits long, any fixed point would necessarily also have to be 128 bits long. Assuming that the MD5 sum of any string is uniformly distributed over all possible sums, then the probability that any given 128-bit string is a...