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Java regex capturing groups indexes
...d when you need to repeat a sequence of patterns, e.g. (\.\w+)+, or to specify where alternation should take effect, e.g. ^(0*1|1*0)$ (^, then 0*1 or 1*0, then $) versus ^0*1|1*0$ (^0*1 or 1*0$).
A capturing group, apart from grouping, will also record the text matched by the pattern inside the cap...
Can I change a private readonly field in C# using reflection?
...Console.WriteLine(test.foo);
}
}
This works fine. (Java has different rules, interestingly - you have to explicitly set the Field to be accessible, and it will only work for instance fields anyway.)
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Difference between a Factory, Provider and a Service?
What is the difference between the terms Factory, Provider and Service?
1 Answer
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How do I center align horizontal menu?
... involves a widthless float wrapper that is floated to the left and then shifted off screen to the left width position:relative; left:-50%. Next the nested inner element is reversed and a relative position of +50% is applied. This has the effect of placing the element dead in the center. Relative po...
Form inline inside a form horizontal in twitter bootstrap?
...6 div and an horizontal form class on a span12 div
– Iftah
Jan 7 '13 at 9:14
3
This works for boo...
Can I find out the return value before returning while debugging in Visual Studio?
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Not that I know of. Note that if you do add a variable, it will get removed by the compiler in release builds anyway...
Update:
This functionality has been added to VS2013.
You can see the return values in the autos windows or use $ReturnValue in the wat...
Importance of varchar length in MySQL table
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No, in the sense that if the values you're storing in that column are always (say) less than 50 characters, declaring the column as varchar(50) or varchar(200) has the same performance.
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how do you filter pandas dataframes by multiple columns
To filter a dataframe (df) by a single column, if we consider data with male and females we might:
6 Answers
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Filtering for empty or NULL names in a queryset
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You could do this:
Name.objects.exclude(alias__isnull=True)
If you need to exclude null values and empty strings, the preferred way to do so is to chain together the conditions like so:
Name.objects.exclude(alias__isnull=True).exclude(alias__exact='')
Chaining these methods togethe...
What is the difference between a.getClass() and A.class in Java?
...that there would be performance or other subtle benefits to using both in different circumstances (just like there are with Class.forName() and ClassLoader.loadClass() .
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