Returns text transformed into HTML using simple formatting rules. Two or more consecutive newlines(\n\n) are considered as a paragraph and wrapped in <p> tags. One newline (\n) is considered as a linebreak and a <br /> tag is appended. This method does not remove the newlines from the text.
# File actionpack/lib/action_view/helpers/text_helper.rb, line 156 def simple_format(text) content_tag 'p', text.to_s. gsub(/\r\n?/, "\n"). # \r\n and \r -> \n gsub(/\n\n+/, "</p>\n\n<p>"). # 2+ newline -> paragraph gsub(/([^\n]\n)(?=[^\n])/, '\1<br />') # 1 newline -> br end