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Regular expression to match balanced parentheses
...o at regex101; The pattern is pasted at (?R) which represents (?0).
Perl, PHP, Notepad++, R: perl=TRUE, Python: Regex package with (?V1) for Perl behaviour.
Ruby using subexpression calls.
With Ruby 2.0 \g<0> can be used to call full pattern.
\((?>[^)(]+|\g<0>)*\)
Demo at Rubu...
What is the best way to remove accents (normalize) in a Python unicode string?
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This looks elegant in harnessing the semantic descriptions of characters that are available. Do we really need the unicode function call in there with python 3 though? I think a tighter regex in place of the find would avoid all the trouble mentioned in the comment above...
How to evaluate a math expression given in string form?
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I try to give a description of what I understand from the code written by Boann, and examples described wiki.The logic of this algoritm starting from rules of operation orders. 1. operator sign | variable evaluation | function call | parent...
How can I convert an image into a Base64 string?
...m i can put that String (encondedImage) into a remote database column with PHP+JSON ???? wich type haves to be the column of the database? VARCHAR?
– NullPointerException
Jan 28 '11 at 19:46
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Adding information to an exception?
...ure that there is a (comma,) behind the one element.
Turning a totally nondescript TypeError into a nice message with hints towards a solution without messing up the original Exception.
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Saving grid.arrange() plot to file
...omeone describing the exact problem I have, I have quoted from the problem description from link :
6 Answers
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Nested attributes unpermitted parameters
... white-list all nested parameters.
params.require(:widget).permit(:name, :description).tap do |whitelisted|
whitelisted[:position] = params[:widget][:position]
whitelisted[:properties] = params[:widget][:properties]
end
This method has advantage over other solutions. It allows to permit deep-...
What's the best way to validate an XML file against an XSD file?
...01/XMLSchema which defines XSDs. The above code validates a WAR deployment descriptor against the URL http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd but you could just as easily validate against a local file.
You should not use the DOMParser to validate a document (unless your goal is to create a ...
Which are more performant, CTE or temporary tables?
...a CTE "can be thought of as temporary result set" this is a purely logical description. More often than not it is not materlialized in its own right.
What is a temporary table?
This is a collection of rows stored on data pages in tempdb. The data pages may reside partially or entirely in memory. A...
Can an array be top-level JSON-text?
... @Matthew - Thanks for that, I was getting horribly confused. The json.org description doesn't mention the more restrictive concept of "json-text" at all, and the RFC's kind of vague about its significance.
– mrec
Feb 15 '13 at 17:46
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