Homework & Coursework Questions

grep defaults to RE, and I don't find a solution with RE.
But there are some solutions with ERE (extended regular expression).
Also the example in previous post let me think that you all mean ERE when saying "regular expression":

Code:

^[a-z]{10}$

where {10} is ERE (while \{10\} is RE).
So I suggest to study man egrep
and only take the ERE option from man grep.

There is a solution with either BRE (basic regular expression) or ERE, that does not matter.

Like the previous poster, I can confirm there is a solution to this delightful little problem. And it's not a trick question. The solution is a great demonstration of how useful regular expressions can be.

Hey, original poster, where are you? We'd like to hear what you tried so far, or if the assignment is over.

I will give a hint: what is the mathematical definition of "odd" and "even"? The answer should help with the regexp.

I hope this helps.

bakunin

After some thinking I got the answer I guess.... group multiples of any 2 characters will give you the even number of characters (including whitespaces).

Now for finding odd exclude the lines which match above pattern

I'm afraid that's pretty vague. But maybe it's better you didn't post anything concrete. I don't know what the rules are about posting a solution to this homework assignment. Is the class over? Of course, no way to know. Any guidance from the administrators?

There are no real rules regarding this (btw., this might be a good idea for an amendment), but informally we always have tried to give the students pointers but still leave the work to do it themselves.

Posts with outright, full-blown solutions were typically moderated (set to invisible for normal users) until the thread-o/p posted a solution of his own. Users posting such solutions here usually get a PM explaining the special nature of this board and what we are trying to do here and asking them to contribute accordingly - pointers, but no solutions.

In this case, though, it looks like the thread-o/p has abandoned the thread (he was last active three weeks ago) and if alvincorrea wants to attempt to solve the puzzle he could do so in the normal forae:

I hope this helps.

bakunin