How to fix 301 permalink redirect for funky structure -

i'm trying figure out how redirect permalink structure of old wordpress news portals, using funky structures needed google news , old search engines, crap.

for example, have:

mynewssite.xcom/2015/03/19/fnw14770_161419.php 

where i'd rather have:

mynewssite.xcom/pretty-nameo-of-the-article-fnw14770/ 

i okay instead:

mynewssite.xcom/pretty-name-of-the-article-fnw14770_161419.php 

my current wordpress permalink structure is:

/%year%/%monthnum%/%day%/fnw%post_id%_%hour%%minute%%second%.php 

i need 301 redirect /%postname%/ or /%postname%-%post_id%/, or in worst case senario, this:

%postname%-fnw%post_id%_%hour%%minute%%second%.php 

i don't know how write rewrite expressions. have now, it's not working:

redirectmatch 301 ^/([0-9]{4})/([0-9]{2})/([0-9]{2})/fnw(\d+)_%hour%%minute%%second%.php$ http://floridanewswire.com/?p=$4 

%hour%%minute%%second% won't work in .htaccess, meta information known wordpress. instead, try replacing rule matches 6 digits, such \d{6}

also, should remove unnecessary capture groups, escape forward sashes , dots, , use \d instead of [0-9].

here fixed , simplified version of expression:

redirectmatch 301 ^\/\d{4}\/\d{2}\/\d{2}\/fnw(\d+)_\d{6}\.php http://floridanewswire.com/?p=$1 

you should able change permalinks cleaner structure on settings > permalinks admin menu , have old permalinks redirected through htaccess rule.