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What is a regular expression for a MAC Address?
...perty \p{xdigit} includes the FULLWIDTH versions. You might prefer \p{ASCII_Hex_Digit} instead.
The answer to the question asked might be best answered — provided you have a certain venerable CPAN module installed — by typing:
% perl -MRegexp::Common -lE 'say $RE{net}{MAC}'
I show the partic...
How to properly reuse connection to Mongodb across NodeJs application and modules
...re( 'mongodb' ).MongoClient;
const url = "mongodb://localhost:27017";
var _db;
module.exports = {
connectToServer: function( callback ) {
MongoClient.connect( url, { useNewUrlParser: true }, function( err, client ) {
_db = client.db('test_db');
return callback( err );
} );...
Is there a setting on Google Analytics to suppress use of cookies for users who have not yet given c
...ve defined elsewhere
window['ga-disable-UA-XXXXXX-Y'] = true;
}
var _gaq = _gaq || [];
_gaq.push(['_setAccount', 'UA-XXXXXXX-Y']);
_gaq.push(['_trackPageview']);
function onOptIn(){ //have this run when/if they opt-in.
window['ga-disable-UA-XXXXXX-Y'] = false;
//...snip......
Why does calling a function in the Node.js REPL with )( work?
..., World!"); }
hi)(
Error:
SyntaxError: Unexpected token )
at Module._compile (module.js:439:25)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Function.Module.runMain (module.js:497:10)
a...
Code Golf - π day
...
Perl, 95 96 99 106 109 110 119 characters:
$t+=$;=1|2*sqrt($r**2-($u-2*$_)**2),say$"x($r-$;/2).'*'x$;for 0..
($u=($r=<>)-1|1);say$t*2/$r**2
(The newline can be removed and is only there to avoid a scrollbar)
Yay! Circle version!
$t+=$;=
1|2*sqrt($r**
2-($u-2*$_)**2)
,say$"x($r-$;/2
)....
Passing functions with arguments to another function in Python?
... y):
return x+y
# declare partial function
def addPartial(x):
def _wrapper(y):
return add(x, y)
return _wrapper
# run example
def main():
f = addPartial(3)
result = runOp(f, 1) # is 4
Use partial from functools
This is almost identical to lambda shown above. Then why...
How to trigger a build only if changes happen on particular set of files
...s, I have a repositorie with multiple modules (domain, common, api, desktop_app,...) I want trigger a build for desktop_app for example, I put on the "included regions" production_app/*, I tried several combinations like ./desktop_app even absolute path. AndI always got Ignored commit c6e2b1dca0d188...
Convert pem key to ssh-rsa format
...pub -i -mPKCS8
From the ssh-keygen docs (From man ssh-keygen):
-m key_format Specify a key format for the -i (import) or -e (export) conversion options. The supported key formats are: “RFC4716” (RFC 4716/SSH2 public or private key), “PKCS8” (PEM PKCS8 public key) or “PEM” (PEM pub...
How to copy a row and insert in same table with a autoincrement field in MySQL?
...
Use INSERT ... SELECT:
insert into your_table (c1, c2, ...)
select c1, c2, ...
from your_table
where id = 1
where c1, c2, ... are all the columns except id. If you want to explicitly insert with an id of 2 then include that in your INSERT column list and your SE...
Python memory usage of numpy arrays
...
b.__sizeof__() is equivalent to sys.getsizeof(b)
– palash
Feb 27 at 7:02
1
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