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Is there a regular expression to detect a valid regular expression?
... # end of string
/
This is a recursive regex, and is not supported by many regex engines. PCRE based ones should support it.
Without whitespace and comments:
/^((?:(?:[^?+*{}()[\]\\|]+|\\.|\[(?:\^?\\.|\^[^\\]|[^\\^])(?:[^\]\\]+|\\.)*\]|\((?:\?[:=!]|\?<[=!]|\?>)?(?1)??\)|\(\?(?:R|[+-]...
How often does python flush to a file?
...written from the buffer to the file). You can explicitly flush the buffer by calling the flush() method on a file handle.
– Corey Goldberg
Mar 5 '19 at 4:59
3
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How to get line count of a large file cheaply in Python?
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You can approximate a line count by sampling. It can be thousands of times faster. See: documentroot.com/2011/02/…
– Erik Aronesty
Jun 14 '16 at 20:30
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WPF TextBox won't fill in StackPanel
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I've had the same problem with StackPanel, and the behavior is "by design". StackPanel is meant for "stacking" things even outside the visible region, so it won't allow you to fill remaining space in the stacking dimension.
You can use a DockPanel with LastChildFill set to true and dock...
Which kind of pointer do I use when?
...y and you want to adopt it to the RAII principle. This one was not adopted by the standard.
Unique ownership:
Boost also has a scoped_ptr, which is not copyable and for which you can not specify a deleter. std::unique_ptr is boost::scoped_ptr on steroids and should be your default choice when you n...
Using semicolon (;) vs plus (+) with exec in find
...e command:
ls file1 file2 file3
The number of filenames is only limited by the system's maximum command line length. If the command exceeds this length, the command will be called multiple times.
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How/When does Execute Shell mark a build as failure in Jenkins?
...id:
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 SVN c...
Private vs Public in Cache-Control
...aching web pages to reduce the amount of bandwidth needed and lower costs. By using cache-control:private, you are specifying that it shouldn't cache the page (but allowing the final user to do so). If you use cache-control: public, you are saying that it's okay for everyone to cache the page, and s...
Python name mangling
... def push(self, value):
self.__storage.append(value)
write this by default:
class Stack(object):
def __init__(self):
self.storage = [] # No mangling
def push(self, value):
self.storage.append(value)
This is for sure a controversial way of doing things. Python ...
How to get everything after a certain character?
...answered Jul 10 '12 at 1:38
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