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What is the difference between square brackets and parentheses in a regex?
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These regexes are equivalent (for matching purposes):
/^(7|8|9)\d{9}$/
/^[789]\d{9}$/
/^[7-9]\d{9}$/
The explanation:
(a|b|c) is a regex "OR" and means "a or b or c", although the presence of brackets, necessary for the OR, also captures the digit. To be strictly equivalent, you...
Passing just a type as a parameter in C#
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answered Jun 8 '12 at 20:22
Reed CopseyReed Copsey
509k6868 gold badges10671067 silver badges13241324 bronze badges
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Removing duplicates in lists
... whatever you are trying to do:
>>> t = [1, 2, 3, 1, 2, 5, 6, 7, 8]
>>> t
[1, 2, 3, 1, 2, 5, 6, 7, 8]
>>> list(set(t))
[1, 2, 3, 5, 6, 7, 8]
>>> s = [1, 2, 3]
>>> list(set(t) - set(s))
[8, 5, 6, 7]
As you can see from the example result, the original o...
Find which commit is currently checked out in Git
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182
You have at least 5 different ways to view the commit you currently have checked out into your ...
python numpy machine epsilon
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ali_mali_m
58.1k1515 gold badges172172 silver badges252252 bronze badges
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How to tell if a file is git tracked (by shell exit code)?
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8 Answers
8
Active
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Is MATLAB OOP slow or am I doing something wrong?
... 0.02261 sec 0.23 usec per call
nop1-5() functions: 0.02182 sec 0.22 usec per call
nop() subfunction: 0.02244 sec 0.22 usec per call
@()[] anonymous function: 0.08461 sec 0.85 usec per call
nop(obj) method: 0.24664 sec 2.47 usec per call
no...
How do I extract the contents of an rpm?
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186
Did you try the rpm2cpio commmand? See the example below:
$ rpm2cpio php-5.1.4-1.esp1.x86_64.r...
Fetch first element which matches criteria
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edited Apr 8 '14 at 15:22
answered Apr 8 '14 at 14:45
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Convert data.frame column to a vector?
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8
[..., drop = F] will always return a data frame
– hadley
Aug 16 '11 at 18:19
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