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Extract a regular expression match
...,perl=TRUE)
[1] "12"
Trying to substitute out non-digits will lead to an error in this case.
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Understanding the meaning of the term and the concept - RAII (Resource Acquisition is Initialization
...ata(FileHandle("C:\\source"), FileHandle("C:\\dest"));
}
There are three error cases to handled: no file can be opened, only one file can be opened, both files can be opened but copying the files failed. In a non-RAII implementation, Foo would have to handle all three cases explicitly.
RAII rel...
Index of Currently Selected Row in DataGridView
...innang when you have selected no row, @JayRiggs' solution will throw index error two. You'd better wrapped it with a if
– Allan Ruin
Mar 11 '15 at 1:22
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Android Json and null values
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}
catch(Exception ex) {
LogHelper.e("model", "Error parsing value");
return null;
}
}
and then something like this:
String mFirstName = getJsonString(jsonObject, "first_name");
would give you your string value or safely set your string variable t...
How to show disable HTML select option in by default?
... You should set the value="" so if you also have required then an error will be raised to choose from the dropdown, otherwise a empty value gets passed even though nothing was selected. <option selected="true" disabled="disabled" value="">Choose Tagging</option>
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What is a magic number, and why is it bad? [closed]
...curacy) usually means the symbolic identifier or constant is less prone to error. Recognition of "Pi" as a name is a simply a convenient bonus, but is not the primary reason for having the constant.
Meanwhile: Back at the Ranch
Laying aside common constants like Pi, let's focus primarily on number...
Cannot lower case button text in android studio
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After adding this, i am having inflation error with arrayindexoutofboundsexception.
– M. Usman Khan
Feb 10 '16 at 16:00
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How to get WordPress post featured image URL
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The one that is at the top didn't work (without PHP errors, which I didn't want as I'm building a WordPress theme for the masses) but this one did. +1
– Calum Childs
Sep 26 '18 at 16:37
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How to select multiple rows filled with constants?
...as a life saver. One thing to note: If you have run into a too many values error, you can just do a UNION ALL in the WITH clause.
– ScrappyDev
Sep 18 '18 at 19:47
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pg_config executable not found
I am having trouble installing psycopg2. I get the following error when I try to pip install psycopg2 :
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