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What's the difference between utf8_general_ci and utf8_unicode_ci?
...tation from early MySQL versions which remains only for backward compatibility. The fixed version was given the name utf8mb4.
Note: Newer versions of MySQL have updated Unicode sorting rules, available under names such as utf8mb4_0900_ai_ci for equivalent rules based on Unicode 9.0 - and with no equ...
How to detect total available/free disk space on the iPhone/iPad device?
...eFileSystemSizeInBytes unsignedLongLongValue];
NSLog(@"Memory Capacity of %llu MiB with %llu MiB Free memory available.", ((totalSpace/1024ll)/1024ll), ((totalFreeSpace/1024ll)/1024ll));
} else {
NSLog(@"Error Obtaining System Memory Info: Domain = %@, Code = %ld", [error domai...
Combining two expressions (Expression)
...e logical expressions, but the problem is the parameters; are you working with the same ParameterExpression in expr1 and expr2? If so, it is easier:
var body = Expression.AndAlso(expr1.Body, expr2.Body);
var lambda = Expression.Lambda<Func<T,bool>>(body, expr1.Parameters[0]);
This als...
How to convert CFStringRef to NSString?
...l. The key thing to note is that CoreFoundation will often return objects with +1 reference counts, meaning that they need to be released (all CF[Type]Create format functions do this).
The nice thing is that in Cocoa you can safely use autorelease or release to free them up.
...
How to become an OpenCart guru? [closed]
It seems like they have no documentation except some api calls on their official forums. I have experience with Zend framework and CodeIgniter framework. Can any OpenCart masters recommend me the best way to learn it and master in shortest amount of time? I have to do a big project with it soon.
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jQuery find events handlers registered with an object
...follow
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edited Jan 10 '13 at 17:15
gnarf
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Reimport a module in python while interactive
I know it can be done, but I never remember how.
6 Answers
6
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Regular expression for letters, numbers and - _
...
The pattern you want is something like (see it on rubular.com):
^[a-zA-Z0-9_.-]*$
Explanation:
^ is the beginning of the line anchor
$ is the end of the line anchor
[...] is a character class definition
* is "zero-or-more" repetition
Note that the literal dash -...
How to replace plain URLs with links?
... idea. You must imagine this is a common enough problem that someone has written, debugged and tested a library for it, according to the RFCs. URIs are complex - check out the code for URL parsing in Node.js and the Wikipedia page on URI schemes.
There are a ton of edge cases when it comes to parsi...
What exactly does Perl's “bless” do?
...
In general, bless associates an object with a class.
package MyClass;
my $object = { };
bless $object, "MyClass";
Now when you invoke a method on $object, Perl know which package to search for the method.
If the second argument is omitted, as in your example, t...