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RegEx to find two or more consecutive chars
...z] instead of the [a-zA-Z] to get small and upper case alpha chars
http://www.w3schools.com/jsref/jsref_obj_regexp.asp
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Determine the number of lines within a text file
...
Seriously belated edit: If you're using .NET 4.0 or later
The File class has a new ReadLines method which lazily enumerates lines rather than greedily reading them all into an array like ReadAllLines. So now you can have both efficiency and conciseness with:
var l...
Meaning of $? (dollar question mark) in shell scripts
...special variables like this, as you can see on this online manual: https://www.gnu.org/s/bash/manual/bash.html#Special-Parameters
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Compare two data.frames to find the rows in data.frame 1 that are not present in data.frame 2
..., this is one of the best summaries I've seen put together to date: http://www.vertabelo.com/blog/technical-articles/sql-joins
But back to this question - here are the results for the setdiff() code when using the OP's data:
> a1
a b
1 1 a
2 2 b
3 3 c
4 4 d
5 5 e
> a2
a b
1 1 a
2 2 b
3 ...
Android YouTube app Play Video Intent
...bIntent = new Intent(Intent.ACTION_VIEW,
Uri.parse("http://www.youtube.com/watch?v=" + id));
try {
context.startActivity(appIntent);
} catch (ActivityNotFoundException ex) {
context.startActivity(webIntent);
}
}
Note: Beware when you are using this met...
Margin while printing html page
...html body element, which is normally controlled by the browser. See http://www.w3.org/TR/1998/REC-CSS2-19980512/page.html.
This currently works in all major browsers except Safari.
In Internet explorer, the margin is actually set to this value in the settings for this printing, and if you do Previe...
send/post xml file using curl command line
...rl to pass the data to the
server using the content-type
application/x-www-form-urlencoded.
Compare to -F/--form.
-d/--data is the same as --data-ascii. To post data purely binary, you should
instead use the --data-binary option.
To URL-encode the value of a form
field you may use -...
'AND' vs '&&' as operator
...g on how it's being used, it might be necessary and even handy.
http://php.net/manual/en/language.operators.logical.php
// "||" has a greater precedence than "or"
// The result of the expression (false || true) is assigned to $e
// Acts like: ($e = (false || true))
$e = false || true;
// The cons...
NPM - How to fix “No readme data”
...rue in your package.json, then npm will refuse to publish it. ref: https://www.npmjs.org/doc/files/package.json.html
– AlexStack
Nov 5 '14 at 12:51
3
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Creating an iframe with given HTML dynamically
...r will be invoked and process the attribute as expected.
http://jsfiddle.net/9k9Pe/2/
var iframe = document.createElement('iframe');
var html = '<body>Foo</body>';
iframe.src = 'data:text/html;charset=utf-8,' + encodeURI(html);
document.body.appendChild(iframe);
console.log('iframe.co...