문자열 내에 링크가 있으면 <a href> 구문을 추가해주는 헬퍼

def convert_link_in_string( string )
   regex = "\\b(https?|ftp|file)://[-a-zA-Z0-9+&@#/%?=~_|!:,.;]*[-a-zA-Z0-9+&@#/%=~_|]"
   
   content = string
   
   if string.match( regex ).present? &&  string.match( regex )[0].present? && string.match( regex )[0].include?('http')
      link = string.match( regex )[0]
      content = string.gsub(link, "<a href=#{ link } target='_blank'>#{ link }</a>")
   end
   
   return raw( content )
end