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What is a regular expression for a MAC Address?
...at" comes from Wikipedia, not the 802.3 standards body. IEEE 802-2014 actually specifies hyphens for ordinary MAC addresses (§ 8.1 ¶ 3) and colons for the obsolescent bit-reversed notation (¶ 4). Importantly, in practice, no one observes this. We simply use one or the other, but never mix them...
Split Java String by New Line
...uld cover you:
String lines[] = string.split("\\r?\\n");
There's only really two newlines (UNIX and Windows) that you need to worry about.
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Given a class, see if instance has method (Ruby)
...d
then read this:
In Ruby, a property (attribute) on your model is basically a method also. So method_defined? will also return true for properties, not just methods.
For example:
Given an instance of a class that has a String attribute first_name:
<instance>.first_name.class #=> Stri...
How to drop columns using Rails migration
...ange method that can be reverted* you'll need to inform the data type (and all other field modifiers), so if you rollback that migration, the field can be correctly recreated. * When I say reverted, that's in terms of database structure, of course, data from that column obviously will be lost.
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Explicitly select items from a list or tuple
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edited Nov 25 '15 at 17:32
answered Jul 9 '11 at 1:53
Dan...
TypeScript and field initializers
...hink its worth repeating. Your bob is of the type Person, but it is not at all an instance of Person. Imagine that Person actually would be a class with a complex constructor and a bunch of methods, this approach would fall flat on its face. It's good that a bunch of people found your approach usefu...
How to scp in Python?
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Martin Prikryl
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answered Nov 26 '10 at 3:03
Tom ShenTom Shen...
How to saveHTML of DOMDocument without HTML wrapper?
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All of these answers are now wrong, because as of PHP 5.4 and Libxml 2.6 loadHTML now has a $option parameter which instructs Libxml about how it should parse the content.
Therefore, if we load the HTML with these options
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Write a program that will surely go into deadlock [closed]
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gstackoverflow
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answered Feb 15 '12 at 1:26
Yuriy ZubarevYuriy Zubarev
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Passport.js - Error: failed to serialize user into session
...d serializing user information but only id's (for bloat/perf reasons personally).
– electblake
Jan 22 '16 at 20:03
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