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How do you match only valid roman numerals with a regular expression?
...s:
^M{0,4}(CM|CD|D?C{0,3})(XC|XL|L?X{0,3})(IX|IV|V?I{0,3})$
Breaking it down, M{0,4} specifies the thousands section and basically restrains it to between 0 and 4000. It's a relatively simple:
0: <empty> matched by M{0}
1000: M matched by M{1}
2000: MM matched by M{2}
3000...
How Do I Document Packages in Java?
In the Java APIs I can see Javadoc comments for packages.
3 Answers
3
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Using Java 8's Optional with Stream::flatMap
...ode, but I have come across a seemingly-simple situation that is tricky to do concisely.
12 Answers
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How to cast List to List
This does not compile, any suggestion appreciated.
15 Answers
15
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Run function from the command line
....py):
$ python -c 'import foo; print foo.hello()'
Alternatively, if you don't care about namespace pollution:
$ python -c 'from foo import *; print hello()'
And the middle ground:
$ python -c 'from foo import hello; print hello()'
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Best way to test SQL queries [closed]
...s you to add "shims" between them, and "wrappers" around them, just as you do in procedural code.
How do you do this? By making each significant thing a query does into a view. Then you compose more complex queries out of these simpler views, just as you compose more complex functions out of more p...
How to do constructor chaining in C#
...base(...)
you can put extra code into each constructor
the default (if you don't specify anything) is base()
For "why?":
code reduction (always a good thing)
necessary to call a non-default base-constructor, for example:
SomeBaseType(int id) : base(id) {...}
Note that you can also use object...
How to change the author and committer name and e-mail of multiple commits in Git?
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This answer uses git-filter-branch, for which the docs now give this warning:
git filter-branch has a plethora of pitfalls that can produce non-obvious manglings of the intended history rewrite (and can leave you with little time to investigate such problems since it has suc...
How to remove folders with a certain name
In Linux, how do I remove folders with a certain name which are nested deep in a folder hierarchy?
11 Answers
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Why do people hate SQL cursors so much? [closed]
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that article is 7 years old, do you think that perhaps things might have changed in the meantime?
– Steven A. Lowe
Nov 13 '08 at 16:46
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