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What is a word boundary in regex?
...put, among other purposes) and cannot find a precise definition of \b ("word boundary"). I had assumed that -12 would be an "integer word" (matched by \b\-?\d+\b ) but it appears that this does not work. I'd be grateful to know of ways of matching space-separated numbers.
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Regex to test if string begins with http:// or https://
...hich will check the start of a string, and if it contains either http:// or https:// it should match it.
9 Answers
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JSON.parse unexpected character error
I get this error:
3 Answers
3
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How do I sort an array of hashes by a value in the hash?
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Ruby's sort doesn't sort in-place. (Do you have a Python background, perhaps?)
Ruby has sort! for in-place sorting, but there's no in-place variant for sort_by in Ruby 1.8. In practice, you can do:
sorted = sort_me.sort_by { |k| k["v...
Check if a string contains one of 10 characters
...iew:
var match = str.IndexOfAny(new char[] { '*', '&', '#' }) != -1
Or in a possibly easier to read form:
var match = str.IndexOfAny("*&#".ToCharArray()) != -1
Depending on the context and performance required, you may or may not want to cache the char array.
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Principal component analysis in Python
I'd like to use principal component analysis (PCA) for dimensionality reduction. Does numpy or scipy already have it, or do I have to roll my own using numpy.linalg.eigh ?
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Writing files in Node.js
...n console.log(err);
}
console.log("The file was saved!");
});
// Or
fs.writeFileSync('/tmp/test-sync', 'Hey there!');
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How can I put strings in an array, split by new line?
...e breaks in my database. I want to convert that string into an array, and for every new line, jump one index place in the array.
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When should I use the Visitor Design Pattern? [closed]
I keep seeing references to the visitor pattern in blogs but I've got to admit, I just don't get it. I read the wikipedia article for the pattern and I understand its mechanics but I'm still confused as to when I'd use it.
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Can I use __init__.py to define global variables?
...__init__.py:
MY_CONSTANT = 42
mypackage/mymodule.py:
from mypackage import MY_CONSTANT
print "my constant is", MY_CONSTANT
Then, import mymodule:
>>> from mypackage import mymodule
my constant is 42
Still, if you do have constants, it would be reasonable (best practices, probably) ...