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How to validate an email address using a regular expression?
Over the years I have slowly developed a regular expression that validates MOST email addresses correctly, assuming they don't use an IP address as the server part.
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What characters are allowed in an email address?
I'm not asking about full email validation.
17 Answers
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Fastest way to list all primes below N
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35 Answers
35
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Code Golf: Collatz Conjecture
Inspired by http://xkcd.com/710/ here is a code golf for it.
70 Answers
70
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get list from pandas dataframe column
I have an excel document which looks like this..
7 Answers
7
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What is the difference between Θ(n) and O(n)?
Sometimes I see Θ(n) with the strange Θ symbol with something in the middle of it, and sometimes just O(n). Is it just laziness of typing because nobody knows how to type this symbol, or does it mean something different?
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Are 2^n and n*2^n in the same time complexity?
Resources I've found on time complexity are unclear about when it is okay to ignore terms in a time complexity equation, specifically with non-polynomial examples.
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How to find time complexity of an algorithm
The Question
9 Answers
9
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Assign output of a program to a variable using a MS batch file
I need to assign the output of a program to a variable using a MS batch file.
9 Answers
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Big-O for Eight Year Olds? [duplicate]
I'm asking more about what this means to my code. I understand the concepts mathematically, I just have a hard time wrapping my head around what they mean conceptually. For example, if one were to perform an O(1) operation on a data structure, I understand that the number of operations it has to p...