re = /^([A-Za-z]{2}[0-9*]{0,6}|\*)$/m
str = 'RIGHT:
*
DE*
de*
GB5*
gb5*
DE*123
DE**123
de*123
DE123456
WRONG:
**
*DE
*de
D
D*
D**
d*
DE
DE123
DE123**
de
D1*
1
1*
123*
1234
DE1234567
DE123456*'
# 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