How to correctly compose a regular expression for a surname in Cyrillic in JS?

Question

JavaScript

Requirements:

• Cyrillic only
  
• Possible character "-" - (hyphen)
  
• Possible character " " (space)
  
• Beginning and end of line - Cyrillic only
  
• In the middle of the line, you can use a space or a hyphen, but no more than 1 in a row ("-" or "-" is also impossible)
  

Examples of valid strings:

• "Ivanova"
  
• "Ivanova Petrova"
  
• "Ivanova-Petrova"
  

Examples of invalid strings:

• "-Petrova"
  
• "Petrova-"
  
• "Ivanova-Petrova"
  
• "Ivanova-Petrov"
  
• "Ivanova - Petrova"
  
• "Ivanova--Petrova"
  
• "Ivanova Petrova"
  

I got this nonsense:
^[а-яё]*[а-яё]+[\-\s]?[а-яё]+$

Answer 1

/^[a-яё]+(?:[ -][a-яё]+)*$/i