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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 m>me m>ans "a or b or c", although the presence of brackets, necessary for the OR, also captures the digit. To ...
Parsing IPv6 extension headers containing unknown extensions
I'm writing a very simple net filter, and getting to where I want to parse IPv6 headers to match things like ICMPv6 types, TCP/UDP port numbers, etc.
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Setting JDK in Eclipse
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You manage the list of available compilers in the Window -> Preferences -> Java -> Installed JRE's tab.
In the project build path configuration dialog, under the libraries tab, you can delete the entry for JRE System Li...
What's the difference between == and .equals in Scala?
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You normally use ==, it routes to equals, except that it treats nulls properly. Reference equality (rarely used) is eq.
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Detect if stdin is a terminal or pipe?
When I execute " python " from the terminal with no argum>me m>nts it brings up the Python interactive shell.
6 Answers
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static allocation in java - heap, stack and permanent generation
I have been lately reading a lot on m>me m>mory allocation schem>me m>s in java, and there have been many doubts as I have been reading from various sources. I have collected my concepts, and I would request to go through all of the points and comm>me m>nt on them. I cam>me m> to know that m>me m>mory allocation is JVM spec...
How to send a JSON object using html form data
So I've got this HTML form:
5 Answers
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How can I override inline styles with external CSS?
I have markup that uses inline styles, but I don't have access to change this markup. How do I override inline styles in a docum>me m>nt using only CSS? I don't want to use jQuery or JavaScript.
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Difference between 'python setup.py install' and 'pip install'
I have an external package I want to install into my python virtualenv from a tar file.
What is the best way to install the package?
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Which Boost features overlap with C++11?
I put my C++ skills on the shelf several years ago and it seems now, when I need them again, the landscape has changed.
2 A...