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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-...
The modulo operation on negative numbers in Python
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134
Unlike C or C++, Python's modulo operator (%) always return a number having the same sign as t...
How to assign string to bytes array
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answered Feb 1 '15 at 8:49
openwonkopenwonk
9,73144 gold badges2727 silver badges2525 bronze badges
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CSS: bolding some text without changing its container's size
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11 Answers
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【精心整理】【实用】visual C++中最常用的类与API函数 - C/C++ - 清泛网 -...
...heck(int nCheck);
参数：nCheck 指定设置的状态，0为未选择，1为选中，2为不确定
CByteArray类：该类支持动态的字节数组
CByteArray::GetAt 获取指定下标处的数值，可以用运算符[]代替
BYTE GetAt(int nIndex)const;
参数：nIndex 数组下标，...
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 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....
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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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
1,59211 gold badge1111 silver badges3131 bronze badges
answ...
How do I generate random numbers in Dart?
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13 Answers
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