Rewrite URL on specific condition only

Question

Am trying to create a rewrite rule and struggling from couple of days.

My condition should be in such a way that if in the url after authorbio ONLY ONE WORD is found then leave it as it is. for all remaining conditions it should remove authorbio/

The conditions 2 & 3 in below example are generic and can be done easily but it should be done along with condition#1 in example

Example:

• THIS SHOULD REMAIN AS IT IS:

  /mainblog/authorbio/authorname

  SHOULD BE CHANGED TO

  /mainblog/authorbio/authorname

• WHERE AS THIS SHOULD REMOVE AUTHORBIO FROM THE URL

  /mainblog/authorbio/someblog/blogarticle

  SHOULD BE CHANGED TO

  /mainblog/someblog/blogarticle

• Also THIS SHOULD REMOVE AUTHORBIO FROM THE URL

  /mainblog/authorbio/

  SHOULD BE CHANGED TO

  /mainblog

Answer 1

Place this rule in /mainblog/.htaccess:

RewriteEngine On
RewriteBase /mainblog/

RewriteRule ^authorbio/?$ /mainblog/ [NC,L,R]

RewriteRule ^authorbio/([^/]+/.+)$ $1 [NC,L,R]