MicroPosts

• Comment your regular expressions

  # ❌
  usa_postal_code_pattern = /\A\d{5}(-\d{4})?\z/
  
  # ✅
  usa_postal_code_pattern = %r{
    \A # Beginning of string
    \d{5} # 5 digits
    ( # ZIP+4
      - # Hyphen
      \d{4} # 4 digits
    )? # ZIP+4 is optional
    \z # End of string
  }x
  

  Source: Comment your regular expressions