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What is a regular expression which will match a valid domain name without a subdomain?
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This should match all cases I think: ^([a-z0-9])(([a-z0-9-]{1,61})?[a-z0-9]{1})?(\.[a-z0-9](([a-z0-9-]{1,61})?[a-z0-9]{1})?)?(\.[a-zA-Z]{2,4})+$
– transilvlad
May 16 '13 at 16:38
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Why is there no xrange function in Python3?
...Some performance measurements, using timeit instead of trying to do it manually with time.
First, Apple 2.7.2 64-bit:
In [37]: %timeit collections.deque((x for x in xrange(10000000) if x%4 == 0), maxlen=0)
1 loops, best of 3: 1.05 s per loop
Now, python.org 3.3.0 64-bit:
In [83]: %timeit collec...
what’s the difference between Expires and Cache-Control headers?
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It's worth commenting that cache-control is what all browsers will use, but it's useful to specify both headers just in case there are old proxies in the way.
– Nacho Coloma
Sep 17 '12 at 14:33
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Syntax Error: Not a Chance
...ng blocks by braces instead of indentation will never be implemented.
Normally, imports from the special __future__ module enable features that are backwards-incompatible, such as the print() function, or true division.
So the line from __future__ import braces is taken to mean you want to enable ...
What is the difference between Hibernate and Spring Data JPA
...nd the top level i.e. Spring Data JPA. With the first exception you potentially have to know the lower levels i.e. Hibernate, JDBC and the Database.
– Marmite Bomber
Aug 13 '19 at 16:26
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Detecting Unsaved Changes
...reunload methods as required.
From the comments, the following references all input fields, without duplicating code:
$(':input').change(function () {
Using $(":input") refers to all input, textarea, select, and button elements.
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What are the differences between the different saving methods in Hibernate?
...g of the methods. Mainly these are based on the API though as I don't use all of these in practice.
saveOrUpdate
Calls either save or update depending on some checks. E.g. if no identifier exists, save is called. Otherwise update is called.
save
Persists an entity. Will assign an identifier if...
How do I get an object's unqualified (short) class name?
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You can do this with reflection. Specifically, you can use the ReflectionClass::getShortName method, which gets the name of the class without its namespace.
First, you need to build a ReflectionClass instance, and then call the getShortName method of that instance:...
Best algorithm for detecting cycles in a directed graph [closed]
What is the most efficient algorithm for detecting all cycles within a directed graph?
14 Answers
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Differences between Exception and Error
...un out of resources necessary for it to continue operating.
There are really three important subcategories of Throwable:
Error - Something severe enough has gone wrong the most applications should crash rather than try to handle the problem,
Unchecked Exception (aka RuntimeException) - Very oft...