协助 RUBY 代码从 email 字符串 user@domain.com 获取“用户”、“域”和“domain.com”

Question

Please I need help with something like substring of PHP for Ruby that can make me get "user" "domain" and "domain.com" in this output email "user@domain.com"

eg john@dortmund.com

Let say I have %3% in my line of code to call user the result will be = "john".

Let say I have %2% in my line of code to call domainname the result will be = "dortmund".

Let say I have %1% in my line of code to call domain.com the result will be = "dortmund.com"

I have been cracking my head but couldn't get it.

Thank you

Answer 1

Split is your friend!

email.split(/[@,.]/)
 => ["user", "domain", "com"]

from there you can manipulate the array to get the desired outputs. For example:

email.split(/[@,.]/).last(2).join('.')
 => "domain.com"

Some emails can have multiple dots in them and you may want to handle this:

email = "some.thing@email.com"
email.split(/(.+)@(.+)\.(.+)/).drop(1)
 => ["some.thing", "email", "com"]