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Regex how to match an optional character
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Use
[A-Z]?
to make the letter optional. {1} is redundant. (Of course you could also write [A-Z]{0,1} which would mean the same, but that's what the ? is there for.)
You could improve your regex to
^([0-9]{5})+\s+([A-Z]?)\s+([A-Z])([0-9]{3})([0-9]{3})([A-Z]{3})([A-...
What's the idiomatic syntax for prepending to a short python list?
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819
The s.insert(0, x) form is the most common.
Whenever you see it though, it may be time to cons...
How can I make pandas dataframe column headers all lowercase?
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180
You can do it like this:
data.columns = map(str.lower, data.columns)
or
data.columns = [x....
Change the Right Margin of a View Programmatically?
...= (LinearLayout.LayoutParams)tv.getLayoutParams();
params.setMargins(0, 0, 10, 0); //substitute parameters for left, top, right, bottom
tv.setLayoutParams(params);
I can't test it right now, so my casting may be off by a bit, but the LayoutParams are what need to be modified to change the margin.
N...
How to remove the querystring and get only the url?
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16 Answers
16
Active
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How to determine if a point is in a 2D triangle? [closed]
...nce issues.
And here's some code to get you started:
float sign (fPoint p1, fPoint p2, fPoint p3)
{
return (p1.x - p3.x) * (p2.y - p3.y) - (p2.x - p3.x) * (p1.y - p3.y);
}
bool PointInTriangle (fPoint pt, fPoint v1, fPoint v2, fPoint v3)
{
float d1, d2, d3;
bool has_neg, has_pos;
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Why does Decimal.Divide(int, int) work, but not (int / int)?
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219
int is an integer type; dividing two ints performs an integer division, i.e. the fractional par...
How do I generate random numbers in Dart?
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13 Answers
13
Active
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How do I verify that an Android apk is signed with a release certificate?
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edited Jan 27 '17 at 20:05
Eugene
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