re = /(?<=Sent: Monday, |Tuesday, |Wednesday, |Thursday, |Friday, |Saturday, |Sunday, )(\d\d\s|\d\s)(January |February |March |April |May |June |July |August |September |October |November |December )(20\d\d)/m
str = 'From: john@workplace.com
Sent: Thursday, 23 May 2019 7:14 AM
To: Team Inbox
Subject: Send me some more cookies'
# 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