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How to validate an email address in JavaScript
...Using regular expressions is probably the best way. You can see a bunch of tests here (taken from chromium)
function validateEmail(email) {
const re = /^(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]...
jQuery .hasClass() vs .is()
...
Update:
I committed a test following a comment and four upvotes to very comment. It turns out that what I had said is the correct answer. Here is the result:
http://jsperf.com/hasclass-vs-is-so
The is is multi-purpose, you can for example do is(...
Check if a file exists with wildcard in shell script [duplicate]
... ## If not, f here will be exactly the pattern above
## and the exists test will evaluate to false.
[ -e "$f" ] && echo "files do exist" || echo "files do not exist"
## This is all we needed to know, so we can break after the first iteration
break
done
This is very similar...
Grep characters before and after match?
...
grep -E -o ".{0,5}test_pattern.{0,5}" test.txt
This will match up to 5 characters before and after your pattern. The -o switch tells grep to only show the match and -E to use an extended regular expression. Make sure to put the quotes aroun...
instantiate a class from a variable in PHP?
...
class Test {
public function yo() {
return 'yoes';
}
}
$var = 'Test';
$obj = new $var();
echo $obj->yo(); //yoes
share
|
...
What characters are forbidden in Windows and Linux directory names?
.../, '\0'; the name . was the current directory, of course). It was used to test the Bourne shell and routinely wrought havoc on unwary programs such as backup programs.
Other people have covered the Windows rules.
Note that MacOS X has a case-insensitive file system.
1 It was Kernighan & Pik...
How to find all positions of the maximum value in a list?
...iciencies pointed out by @John Machin. For (2) I attempted to optimize the tests based on guesstimated probability of occurrence of each condition and inferences allowed from predecessors. It was a little tricky figuring out the proper initialization values for max_val and max_indices which worked f...
Why can't R's ifelse statements return vectors?
...ion for ifelse states:
ifelse returns a value with the same
shape as test which is filled with
elements selected from either yes or
no depending on whether the element
of test is TRUE or FALSE.
Since you are passing test values of length 1, you are getting results of length 1. If you p...
Node.js Logging
...n": "%m"
},
"category": "app"
},{
"category": "test-file-appender",
"type": "file",
"filename": "log_file.log",
"maxLogSize": 10240,
"backups": 3,
"layout": {
"type": "pattern",
"pattern": "%d{dd/MM hh:mm} %-...
Understanding __get__ and __set__ and Python descriptors
...can be used as methods with self implicitly passed as first argument.
def test_function(self):
return self
class TestClass(object):
def test_method(self):
...
If you look up test_method on an instance you'll get back a "bound method":
>>> instance = TestClass()
>>...