re = /[Ss_]{1,1}([0-9]{2,2})[Eex\ _]{1,1}/
str = 'un gars une fille s01 ep05 chez psy 01.avi
'
# Print the match result
str.match(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