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Named regular expression group “(?Pregexp)”: what does “P” stand for?
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How to get Linux console window width in Python
...ndow since then).
(See answer by @GringoSuave on how to do this on python 3.3+)
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Delete from the current cursor position to a given line number in vi editor
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213
You could use something like d63G to delete from the current line until line 63.
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Ruby on Rails: How do I add a not null constraint to an existing column using a migration?
In my Rails (3.2) app, I have a bunch of tables in my database but I forgot to add a few not null constraints. I've googled around but I can't find how to write a migration which adds not null to an existing column.
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How to draw polygons on an HTML5 canvas?
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edited Feb 13 '18 at 19:40
answered Jan 29 '11 at 23:03
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multiple definition of template specialization when using different objects
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131
Intuitively, when you fully specialize something, it doesn't depend on a template parameter any...
How to implement a confirmation (yes/no) DialogPreference?
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msbuild.exe staying open, locking files
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Use msbuild with /nr:false.
Briefly: MSBuild tries to do lots of things to be fast, especiall...
Strip Leading and Trailing Spaces From Java String
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603
You can try the trim() method.
String newString = oldString.trim();
Take a look at javadocs
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Rails 4: before_filter vs. before_action
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As we can see in ActionController::Base, before_action is just a new syntax for before_filter.
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