Change in Permalinks Effect SEO?

Hello, i have changed my website permalinks to %postname% after 3 months now because i am newbie so i found that this does SEO friendly links So now i am having problem with lots of error around 40k in webmaster tools. so i searched a lot and come to solution where i need to add redirect code

 RedirectMatch 301 ^/([0-9]{4})/([0-9]{2})/([0-9]{2})/(.*)$ http://www.sitename.com/$4 

Code (markup):

in .htaccess which is working and now all my old links are working with new permalinks. But i want to ask this Does this redirection effect my website anymore.

 

I guess that happened because you changed your permalinks after your pages were already created

 

I don't think there is going to be any problem with regards to that.

 

I am quite sure your website will be ok, if not gets better.

 

Just make sure that every URL that has changed now has a 301 in place to the new URL and you'll be fine.

It will take Google a few weeks to catch up and process all the changes

 

Thanks Guys Shall Remove this when the new links will be indexed with new permalink :

 

I don't think there is going to be any problem with regards to that.

 

yes I do think changing permalink will affect the seo, period.