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How is the AND/OR operator represented as in Regular Expressions?
...e the following situation:
The correct solution for the word would be "part1, part2".
The user should be able to enter either "part1" (answer 1), "part2" (answer 2) or "part1, part2" (answer 3).
I now try to match the string given by the user with the following, automatically created, regex express...
How to find the size of an array in postgresql
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112
As vyegorov mentioned, array_length will do the trick. Or if you know that the array is 1-dim...
How to test which port MySQL is running on and whether it can be connected to?
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13 Answers
13
Active
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How do I remove blank elements from an array?
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511
There are many ways to do this, one is reject
noEmptyCities = cities.reject { |c| c.empty? }
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Disable intellij indexing on specific folder
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edited Jul 1 '11 at 19:34
answered Jun 30 '11 at 13:30
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Transform DateTime into simple Date in Ruby on Rails
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167
DateTime#to_date does exist with ActiveSupport:
$ irb
>> DateTime.new.to_date
NoMethodE...
Ruby ampersand colon shortcut [duplicate]
...foo }
something(&:foo)
Also, to_proc on Symbol is implemented in Ruby 1.8.7 and 1.9, so it is in fact a "ruby thing".
So, to sum up: & calls to_proc on the object and passes it as a block to the method, and Ruby implements to_proc on Symbol.
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Replace X-axis with own values
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179
Not sure if it's what you mean, but you can do this:
plot(1:10, xaxt = "n", xlab='Some Letter...
Get first and last date of current month with JavaScript or jQuery [duplicate]
...= new Date();
var firstDay = new Date(date.getFullYear(), date.getMonth(), 1);
var lastDay = new Date(date.getFullYear(), date.getMonth() + 1, 0);
or you might prefer:
var date = new Date(), y = date.getFullYear(), m = date.getMonth();
var firstDay = new Date(y, m, 1);
var lastDay = new Date(y, m...
How to get a list of all valid IP addresses in a local network? [closed]
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410
Install nmap,
sudo apt-get install nmap
then
nmap -sP 192.168.1.*
or more commonly
nmap ...