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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...
How to get a list of repositories apt-get is checking? [closed]
...y << current.repos.list
Regarding getting repo from a package (installed or available), this will do the trick
apt-cache policy package_name |grep -m1 http| awk '{ print $2 " " $3 }'
However, that will show you the repository of the latest version available of that package, you may have m...
How to printf “unsigned long” in C?
...here it could print a minus sign when the format specifier was %lu. Technically it's undefined behavior but in reality the variable has an unpredictable value that gets passed to printf which printf then interprets as unsigned. I'm guessing bodacydo's original problem was flow reaching an incorrect ...
How to hide status bar in Android
...l be popped out and at the same time the user can be able to scroll to see all remaining views(ex: compose,subject, send button) in that screen. Similarly in my app I have one activity in that I am having some widgets or views.
Suppose if the user clicks on Edittext which is in my Activity then ...
Regular expression to match non-ASCII characters?
...asiest way to match non-ASCII characters in a regex? I would like to match all words individually in an input string, but the language may not be English, so I will need to match things like ü, ö, ß, and ñ. Also, this is in Javascript/jQuery, so any solution will need to apply to that.
...
How/When does Execute Shell mark a build as failure in Jenkins?
...e said:
If you have a shell script that does "checkout, build, deploy" all by itself, then why are you using Jenkins? You are foregoing all the features of Jenkins that make it what it is. You might as well have a cron or an SVN post-commit hook call the script directly. Jenkins performing the S...
Why does direction of index matter in MongoDB?
...d query in the same order as the index will simply return the rows sequentially in the correct order.
Finding a record in a BTree takes O(Log(n)) time. Finding a range of records in order is only OLog(n) + k where k is the number of records to return.
If the records are out of order, the cost coul...
Remove leading or trailing spaces in an entire column of data
How do I remove leading or trailing spaces of all cells in an entire column?
6 Answers
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Postgis installation: type “geometry” does not exist
...his is specific to a particular database that you are using. It is not installation-wide.
– fooquency
Aug 16 '17 at 20:42
1
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SparseArray vs HashMap
...pe.
There are some variants for different key/value types, even though not all of them are publicly available.
Benefits are:
Allocation-free
No boxing
Drawbacks:
Generally slower, not indicated for large collections
They won't work in a non-Android project
HashMap can be replaced by the fol...