re = /(?(DEFINE)(?<cons>\b(?:
(?<x>\d*)
(?:(?<a0>0)|(?<a1>1)|(?<a2>2)|(?<a3>3)|(?<a4>4)
|(?<a5>5)|(?<a6>6)|(?<a7>7)|(?<a8>8))
(?<y>
,\g{x}
(?(a0)1)(?(a1)2)(?(a2)3)(?(a3)4)(?(a4)5)
(?(a5)6)(?(a6)7)(?(a7)8)(?(a8)9)
| 9 (?&y) 0
)
# handle the 999 => 1000 case separately
| (?<z> 9,10 | 9(?&z)0 )
)\b))
# list of two or more consecutive integers
(?=(?&cons))\d+
(?:,(?=(?&cons))\d+)*
,\d+/x
str = '0,1,2,3
8,9,10,11
1999,2000,2001
99,100,101
42
3,2,1
1,2,4
10,11,13'
# 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