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What is a regular expression which will match a valid domain name without a subdomain?
...ee comments), given your specific requirements:
/^[a-zA-Z0-9][a-zA-Z0-9-]{1,61}[a-zA-Z0-9]\.[a-zA-Z]{2,}$/
But note this will reject a lot of valid domains.
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How to change the order of DataFrame columns?
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Extracting the last n characters from a string in R
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15 Answers
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How to get a string after a specific substring?
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419
The easiest way is probably just to split on your target word
my_string="hello python world , ...
Why does the C preprocessor interpret the word “linux” as the constant “1”?
...essor in GCC interpret the word linux (small letters) as the constant 1 ?
5 Answers
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Check if all elements in a list are identical
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General method:
def checkEqual1(iterator):
iterator = iter(iterator)
try:
first = next(iterator)
except StopIteration:
return True
return all(first == rest for rest in iterator)
One-liner:
def checkEqual2(iterator):
r...
Throwing cats out of windows
... case of n floors and m cats.
The main formula, a[n][m] = min(max(a[k - 1][m - 1], a[n - k][m]) + 1) : for each k in 1..n, should be self-explanatory:
If first cat is thrown from k-th floor and dies, we now have k - 1 floors to check (all below k) and m - 1 cats (a[k - 1][m - 1]).
If cat surv...