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How to validate an email address using a regular expression?
...-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?|\[(?:(?:(2(5[0-5]|[0-4][0-9])|1[0-9][0-9]|[1-9]?[0-9]))\.){3}(?:(2(5[0-5]|[0-4][0-9])|1[0-9][0-9]|[1-9]?[0-9])|[a-z0-9-]*[a-z0-9]:(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21-\x5a\x53-\x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f])+)\])
or:
(?:[a-z0-9!#$%&'*+...
Does the order of LINQ functions matter?
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147
It will depend on the LINQ provider in use. For LINQ to Objects, that could certainly make a hu...
Convert MySql DateTime stamp into JavaScript's Date format
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418
Some of the answers given here are either overcomplicated or just will not work (at least, not...
Append value to empty vector in R?
...appending for larger vectors.
set.seed(21)
values <- sample(letters, 1e4, TRUE)
vector <- character(0)
# slow
system.time( for (i in 1:length(values)) vector[i] <- values[i] )
# user system elapsed
# 0.340 0.000 0.343
vector <- character(length(values))
# fast(er)
system.time(...
Get the closest number out of an array
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ES5 Version:
var counts = [4, 9, 15, 6, 2],
goal = 5;
var closest = counts.reduce(function(prev, curr) {
return (Math.abs(curr - goal) < Math.abs(prev - goal) ? curr : prev);
});
console.log(closest);
...
Getting a random value from a JavaScript array
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24 Answers
24
Active
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Recommendation for compressing JPG files with ImageMagick
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449
I use always:
quality in 85
progressive (comprobed compression)
a very tiny gausssian blur t...
Divide a number by 3 without using *, /, +, -, % operators
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48 Answers
48
Active
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PostgreSQL Autoincrement
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714
Yes, SERIAL is the equivalent function.
CREATE TABLE foo (
id SERIAL,
bar varchar);
INSERT INT...
Replacing a 32-bit loop counter with 64-bit introduces crazy performance deviations with _mm_popcnt_
...a very weird effect: Changing the loop variable from unsigned to uint64_t made the performance drop by 50% on my PC.
...