17 lines
467 B
Ruby
17 lines
467 B
Ruby
re = /\A # beginning of string
|
|
(?<bb> # begin capture group <bb>
|
|
\[ # literal [
|
|
\g<bb>* # zero or more <bb>
|
|
\] # literal ]
|
|
)* # end group, zero or more such groups
|
|
\z/x # end of string
|
|
|
|
10.times do |i|
|
|
s = (%w{[ ]} * i).shuffle.join
|
|
puts (s =~ re ? " OK: " : "bad: ") + s
|
|
end
|
|
|
|
["[[]", "[]]", "a[ letters[-1] ].xyz[0]"].each do |s|
|
|
t = s.gsub(/[^\[\]]/, "")
|
|
puts (t =~ re ? " OK: " : "bad: ") + s
|
|
end
|