re = /^((?<AddressType>\w+\s*)?(?<Unit>\d+\s*)\/)?(?<StreetNumber>(\s*(\d+\w+)+)|((\s*\d+\s*\-\s*\d+)))(?<StreetNameAndType>(?<StreetType>\s+\w+)+)\s*[,|.]?\s*(?<Suburb>[\w\s]+)\s+(?<PostCode>\d{4})$/mi
str = '1 / 124 OLD SOUTH HEAD RD,VAUCLUSE 2030
37A DAINTREE CL, SOUTH BOWENFELS NSW 2790
unit 11/18-22 bernecker st .Carina 4152
445 VICTORIA RD,RYDALMERE 2116
'
subst = ''
result = str.gsub(re, subst)
# Print the result of the substitution
puts result
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