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Is there a regular expression to detect a valid regular expression?

...th regular languages, being recursive or having balancing groups is just a patch. The language that defines valid regexes is actually a context free grammar, and you should use an appropriate parser for handling it. Here is an example for a university project for parsing simple regexes (without mos...
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How to git-svn clone the last n revisions from a Subversion repository?

...n and git don't work together as good as I would like. I tend to create patch files and apply them on the git clone of another svn branch. share | improve this answer | fo...
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Why git can't do hard/soft resets by path?

...gt;: git reset [-q] [<tree-ish>] [--] <paths>.. git reset (--patch | -p) [<tree-ish>] [--] [<paths>...] 1 is commit-wise: Operates on all files in the referenced <commit>, and may affect the working tree: git reset [<mode>] [<commit>] There's no mode...
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How can I check for “undefined” in JavaScript? [duplicate]

...d = "foo"; "foo" == undefined // true As @CMS pointed out, this has been patched in ECMAScript 5th ed., and undefined is non-writable. if (window.myVar) will also include these falsy values, so it's not very robust: false 0 "" NaN null undefined Thanks to @CMS for pointing out that your third...
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How do I convert a Ruby class name to a underscore-delimited symbol?

... If you don't want to install ActiveSupport just for that, you can monkey-patch underscore into String yourself (the underscore function is defined in ActiveSupport::Inflector): class String def underscore word = self.dup word.gsub!(/::/, '/') word.gsub!(/([A-Z]+)([A-Z][a-z])/,'\1_\2...
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How to do a GitHub pull request

...st from that branch, rebasing it on top of origin/master (making sure your patch is still working) will update the pull request automagically (no need to click on anything) update that branch: if your pull request is rejected, you simply can add new commits, and/or redo your history completely: it w...
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Forgot “git rebase --continue” and did “git commit”. How to fix?

... Either you can tag like @MatrixFrog says or you can save it as a patch too. Then do the rebase abort. Check the status to make sure the repo is in a state that you know had no problems and then start the fetch and rebase. – yasouser Jun 23 '11 at 17:3...
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RuntimeWarning: DateTimeField received a naive datetime

...ue with an existing package that fetches date without timezone and you can patch the package, ignore the warning or set USE_TZ to False. share | improve this answer | follow ...
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Calling virtual functions inside constructors

... the compiler would add code to walk the vtable and look for this case and patch things then? I've never written a C++ compiler and I'm quite sure my initial comment to give this some "love" was naive and this will never happen. :-) A virtual initialize() function isn't a very painful workaround ...
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Firing a double click event from a WPF ListView item using MVVM

...a real headache. It's like being asked to code with 1 arm, 1 eye on an eye patch, and standing on 1 leg. Double click should be simple, and I don't see how all this additional code is worth it. – Echiban Apr 25 '10 at 6:31 ...