re = /^(?:\d{2,3},)+(\d{2,3}),?$|^\d{2,3}$/m
str = '//pass
12,123,56,567,789,11
12,123,56,567,789,11,
12
123
//fail
12,123,56,567,789,11a
a12,123,56,567,789,11
12,123,56,567,789,1
1,123,56,567,789,11
1234,123,56,567,789,11
12,123,56,567,789,1123
1
1234'
# Print the match result
str.scan(re) do |match|
puts match.to_s
end
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Ruby, please visit: http://ruby-doc.org/core-2.2.0/Regexp.html