Rails + REGEX：从电子邮件域中提取名称

Question

I'm creating a new record in Company table based on the logic below:

if company.nil?
  Company.create!(name: User.get_company_name(self.email)), domain: User.get_domain(self.email))
end

I want to extract the name of the domain to place in the Company table. Ie. If I have nick@nike.com, I want to use regular expressions to substitute in 'Nike' as the company name. Or, in the case of ryan@ryandrake.com, I'd want the company name to be 'Ryandrake' .

I already have this method I am using to extract the domain, but haven't managed to edit it to extract the name:

def self.get_domain(email_address)
  email_address.gsub(/.+@([^.]+.+)/, '\1') // Returns 'nike.com' or 'ryandrake.com'
end

Any help with modifying the method above to just return 'Nike' or 'Ryandrake' would be super helpful!

Answer 1

You can do just email_address[/(?<=@)[^.]+/] to get the desired name.

def self.get_domain(email_address)
  email_address[/(?<=@)[^.]+/]
end

Example:

"pavan@gmail.com"[/(?<=@)[^.]+/]
 => "gmail"

DEMO

Answer 2

Use this regex to capture the letters between @ and . : (?<=@)(.*)(?=\\.) and then replace with whole string.

DEMO

or

gsub(/.+(?<=@)(.*)(?=\\.).+/, '\\1')

DEMO

Answer 3

Put the capturing group only to capture the word chars present next to @ . .+ inside the capturing group helps to capture also the .com part also.

email_address.gsub(/.+@([^.]+).+/, '\1')

or

email_address.gsub(/.+@([^.]+)\..+/, '\1')