How to handle a CLI error

Question

I have a simple CLI, something like:

p 'Enter email value'
params[:email] = gets.chomp

and I want to handle email validation and if the email is invalid then rerun the previous prompt.

I have method for validating email, that simply returns true or false, something like:

p 'Enter email value'
params[:email] = gets.chomp
if email invalid
  'error- invalid email'

and again run

p 'Enter email value'
params[:email] = gets.chomp

How can I do it?

Please use proper capitalization and grammar when asking. SO isn't a discussion list where anything goes, it's an online reference book where grammar counts. — the Tin Man, Apr 19 '17 at 22:58
Do you want to determine if an email address is valid according to the RFC rules, or only whether it's a deliverable address? The first takes a very non-trivial pattern. The second is best done by trying to send an email to that address requesting a response. http://stackoverflow.com/a/201378/128421 will help. — the Tin Man, Apr 19 '17 at 23:04

score 0 · Answer 1 · answered Apr 19 '17 at 21:57

0

You can do this with Regular Expressions.

To validate whether the email is a valid one or not, you can use regex like so:

def validate_email
  VALID_EMAIL_REGEX = /\A[\w+\-.]+@[a-z\d\-]+(\.[a-z\d\-]+)*\.[a-z]+\z/i
  if email =~ VALID_EMAIL_REGEX
    # Do someting here
  else
    validate_email
  end
end

answered Apr 19 '17 at 21:57

Carter Brainerd

199
2
10

Regular expressions this simple won't begin to handle the full range of valid Email addresses. – the Tin Man Apr 19 '17 at 23:02
Yes I know, was just using it as an example. He could go so far as to check the email addresses in MX records. – Carter Brainerd Apr 19 '17 at 23:03

score 0 · Answer 2 · answered Apr 19 '17 at 22:03

0

You can enter this code into until loop

p 'Enter email value'
params[:email] = gets.chomp
until email invalid do
        p 'Enter email value'
        params[:email] = gets.chomp
end

Read more at: https://www.tutorialspoint.com/ruby/ruby_loops.htm

answered Apr 19 '17 at 22:03

Dori Aviram

292
2
8

How to handle a CLI error

2 Answers2