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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-...
How to check if a process id (PID) exists
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10 Answers
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jQuery equivalent of JavaScript's addEventListener method
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143
Not all browsers support event capturing (for example, Internet Explorer versions less than 9 ...
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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Changing every value in a hash in Ruby
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11 Answers
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Rails: Why does find(id) raise an exception in rails? [duplicate]
If there is no user with an id of 1 in the database, trying User.find(1) will raise an exception.
2 Answers
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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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How can I select random files from a directory in bash?
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12 Answers
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Ruby Regexp group matching, assign variables on 1 line
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201
You don't want scan for this, as it makes little sense. You can use String#match which will retu...