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Regular Expressions: Is there an AND operator?
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Use a non-consuming regular expression.
The typical (i.e. Perl/Java) notation is:
(?=expr)
This means "match expr but after that continue matching at the original match-point."
You can do as many of these as you want, and this will be ...
Can git undo a checkout of unstaged files
I accidentially discard my changes on files in my local working tree via git checkout. The files aren't staged at this time. Is it posible to "undo" this checkout?
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MongoDB: Combine data from multiple collections into one..how?
How can I (in MongoDB) combine data from multiple collections into one collection?
11 Answers
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Why doesn't indexOf work on an array IE8?
The below function works fine on Opera, Firefox and Chrome. However, in IE8 it fails on the if ( allowed.indexOf(ext[1]) == -1) part.
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jsonify a SQLAlchemy result set in Flask [duplicate]
I'm trying to jsonify a SQLAlchemy result set in Flask/Python.
15 Answers
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Double Negation in C++
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I think cast it explicitly with (bool) would be clearer, why use this tricky !!, because it is of less typing?
– Baiyan Huang
Mar 29 '10 at 3:39
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If strings are immutable in .NET, then why does Substring take O(n) time?
Given that strings are immutable in .NET, I'm wondering why they have been designed such that string.Substring() takes O( substring.Length ) time, instead of O(1) ?
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Fastest way to flatten / un-flatten nested JSON objects
...SON objects. It works, but it's a bit slow (triggers the 'long script' warning).
13 Answers
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What are the First and Second Level caches in Hibernate?
Can anyone explain in simple words what First and Second Level caching in Hibernate are?
7 Answers
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Simple Digit Recognition OCR in OpenCV-Python
I am trying to implement a "Digit Recognition OCR" in OpenCV-Python (cv2). It is just for learning purposes. I would like to learn both KNearest and SVM features in OpenCV.
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