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Start a git commit message with a hashmark (#)

...mit --cleanup=whitespace If you do this you have to be careful to remove all # lines that you don't want to appear in the commit. share | improve this answer | follow ...
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Is there a regular expression to detect a valid regular expression?

...itutions and translations. s/<this part>/.../ It is not theoretically possible to match all valid regex grammars with a regex. It is possible if the regex engine supports recursion, such as PCRE, but that can't really be called regular expressions any more. Indeed, a "recursive regu...
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Parse string to DateTime in C#

...teTime.Parse() will try figure out the format of the given date, and it usually does a good job. If you can guarantee dates will always be in a given format then you can use ParseExact(): string s = "2011-03-21 13:26"; DateTime dt = DateTime.ParseExact(s, "yyyy-MM-dd HH:mm", CultureInfo.Invar...
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How to choose the id generation strategy when using JPA and Hibernate

... The API Doc are very clear on this. All generators implement the interface org.hibernate.id.IdentifierGenerator. This is a very simple interface. Some applications can choose to provide their own specialized implementations, however, Hibernate provides a range ...
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The case against checked exceptions

...jlsberg and his work, this argument has always struck me as bogus. It basically boils down to: "Checked exceptions are bad because programmers just abuse them by always catching them and dismissing them which leads to problems being hidden and ignored that would otherwise be presented to the us...
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Reduce, fold or scan (Left/Right)?

... In general, all 6 fold functions apply a binary operator to each element of a collection. The result of each step is passed on to the next step (as input to one of the binary operator's two arguments). This way we can cumulate a result. ...
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How to round up a number in Javascript?

...d Mar 4 '11 at 7:56 Andrew MarshallAndrew Marshall 87.3k1818 gold badges202202 silver badges204204 bronze badges ...
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How do I tell Git to ignore everything except a subdirectory?

I want to ignore all files in my repository except those that occur in the bin subdirectory. I tried adding the following to my .gitignore : ...
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How can I transform string to UTF-8 in C#?

...hould also write Console.OutputEncoding = System.Text.Encoding.UTF8;!!! Or all utf8 strings will be outputed as gbk... share | improve this answer | follow | ...
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Why is this program erroneously rejected by three C++ compilers?

...ur implementations documentation to see the file formats it supports. Typically, every major compiler vendor supports (canonically defined) text files: any file produced by a text editor, typically a series of characters. Note that the C++ standard is based off the C standard (§1.1/2), and the ...