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How to check if a process id (PID) exists
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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-...
android studio 0.4.2: Gradle project sync failed error
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edited Jan 17 '14 at 8:26
answered Jan 16 '14 at 17:20
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How to generate a random string of a fixed length in Go?
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jQuery equivalent of JavaScript's addEventListener method
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Not all browsers support event capturing (for example, Internet Explorer versions less than 9 ...
How can I select random files from a directory in bash?
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How do I calculate the normal vector of a line segment?
Suppose I have a line segment going from (x1,y1) to (x2,y2). How do I calculate the normal vector perpendicular to the line?
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