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Extract substring in Bash
Given a filename in the form someletters_12345_moreleters.ext , I want to extract the 5 digits and put them into a variable.
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Find Java classes implementing an interface [duplicate]
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Awhile ago, I put together a package for doing what you want, and more. (I needed it for a utility I was writing). It uses the ASM library. You can use reflection, but ASM turned out to perform better.
I put my package in an open source library I have on my web site. The library is here: h...
How to convert PascalCase to pascal_case?
...nce beginning with an uppercase letter can be followed by either:
one or more uppercase letters and digits (followed by either the end of the string or an uppercase letter followed by a lowercase letter or digit ie the start of the next sequence); or
one or more lowercase letters or digits.
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NoSQL Use Case Scenarios or WHEN to use NoSQL [closed]
...e for data loss.
It's often very easy to scale out NoSQL solutions. Adding more nodes to replicate data to is one way to a) offer more scalability and b) offer more protection against data loss if one node goes down. But again, depends on the NoSQL DB/configuration. NoSQL does not necessarily mean "...
Jump to function definition in vim
... Then you can just jump to the function definition using Ctrl-]
There are more tags tricks and tips in this question.
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jQuery.parseJSON throws “Invalid JSON” error due to escaped single quote in JSON
...le-quotes. Single quote characters do not need to be escaped:
Update - More information for those that are interested:
Douglas Crockford does not specifically say why the JSON specification does not allow escaped single quotes within strings. However, during his discussion of JSON in Appendix...
What is the “-->” operator in C++?
...enced by the fact the question was asked in the first place. It makes much more sense to textually bind operators to the thing they're operating on rather than something unrelated, so while (x-- > 0) would be more apt. It also makes it more obvious what's going on (at least in a fixed-font editor...
Why do x86-64 systems have only a 48 bit virtual address space?
...f 256 terabyte. That's a lot. You're not going to see a system which needs more than that any time soon.
So CPU manufacturers took a shortcut. They use an instruction set which allows a full 64-bit address space, but current CPUs just only use the lower 48 bits. The alternative was wasting transist...
How and where are Annotations used in Java?
...to be stored somewhere else, and XML files were frequently used. But it is more convenient to use annotations because they will belong to the Java code itself, and are hence much easier to manipulate than XML.
Usage of annotations:
Documentation, e.g. XDoclet
Compilation
IDE
Testing framework, e....
How can I check if a directory exists in a Bash shell script?
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