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How to negate the whole regex?
...eld under validation must not match the given regular expression; uses the PHP preg_match function internally.
'email' => 'not_regex:/^.+$/i'
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Cannot create an array of LinkedLists in Java…?
...e the row map type a TreeMap, and same for traversing the columns in index order, but if you don't need those cases, HashMap is quicker than TreeMap. Helper methods to get and set an arbitrary cell, handling unset null values, would be useful, of course.
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In Java, how do I check if a string contains a substring (ignoring case)? [duplicate]
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HashSet vs LinkedHashSet
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HashSet is unordered and unsorted Set.
LinkedHashSet is the ordered version of HashSet.
The only difference between HashSet and LinkedHashSet is that:
LinkedHashSet maintains the insertion order.
When we iterate through a HashSet, t...
A 'for' loop to iterate over an enum in Java
...se of lambda and streams (Tutorial):
Stream.of(Direction.values()).forEachOrdered(System.out::println);
Why forEachOrdered and not forEach with streams ?
The behaviour of forEach is explicitly nondeterministic where as the forEachOrdered performs an action for each element of this stream, in t...
What is `git diff --patience` for?
...rther links to algorithms details: fabiensanglard.net/git_code_review/diff.php Hope it will be useful to someone
– SathOkh
Jun 24 '14 at 20:25
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In what order do static/instance initializer blocks in Java run?
...ns several classes, each of which has a static initializer block. In what order do those blocks run? I know that within a class, such blocks are run in the order they appear in the code. I've read that it's the same across classes, but some sample code I wrote disagrees with that. I used this co...
What order are the Junit @Before/@After called?
...e current class, unless they are overridden in the current class. No other ordering is defined.
@After:
The @After methods declared in superclasses will be run after those of the current class, unless they are overridden in the current class.
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Does Java SE 8 have Pairs or Tuples?
...e comparable? Should the class be final or not? Should the two elements be ordered? Should it be an interface or a class? Why stop at pairs? Why not triples, quads, or N-tuples?
And of course there is the inevitable naming bikeshed for the elements:
(a, b)
(first, second)
(left, right)
(car, cdr)...
Why should I care that Java doesn't have reified generics?
...++ templates give you complete type safety, read this: kdgregory.com/index.php?page=java.generics.cpp
– kdgregory
Dec 18 '09 at 14:47
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