re = /(?:^|(?<=[^\d]))\d{9}(?:!|(?=[^\d])|$)/
str = '123741852
blabla n123456789 bla bla 78 texto...
987654321! texto qualquer 12 blaa
123 bla blum 123741852 bobobl
blablum 12345678901 papumpa...
dsafasdfa123741852!wef fdsafafsdqwefqwewq 123741852'
# 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