Regex problem with match method

I want validate many mails ( one or more) with regex expression but this attribute don´t belongs to any model. So I wrote a method:

def emails_are_valid?(emails)
     #regex with validation  
     regex = Regexp.new("^(\s*[a-zA-Z0-9\._%-]+@[a-zA-Z0-9\.-]+\.[a-zA-Z]{2,4}\s*([,]{1}[\s]*[a-zA-Z0-9\._%-]+@[a-zA-Z0-9\.-]+\.[a-zA-Z]{2,4}\s*)开发者_运维知识库*)$")
     #if the quantity of emails is zero o its validations is bad return false.   
     if emails.blank? || emails.match(regex).nil?
          return false
        else
          return true
        end
end

I evaluate this string mm@somedomain.com aa, mma@somedomain.com when I tested this regex in http://www.rubular.com/ is bad (no matches). So According to this page my regex is ok.

But when I evaluate emails.match(regex).nil? that returns me false (So the string is valid, but this string is bad)

Please I need help. my regex is bad or my emails_are_valid? method is bad or match method is bad.

Thanks in advance.

---

You should have used single quotes instead of double quotes when declaring your regex, otherwise \s gets parsed as an escape sequence.

Change that line to

 regex = Regexp.new('^(\s*[a-zA-Z0-9\._%-]+@[a-zA-Z0-9\.-]+\.[a-zA-Z]{2,4}\s*([,]{1}[\s]*[a-zA-Z0-9\._%-]+@[a-zA-Z0-9\.-]+\.[a-zA-Z]{2,4}\s*)*)$')

and the method will work.

On a side note, this would be a more concise way of doing the same thing - http://codepad.org/YbsqIkcP