fast tag creator

hi , i would like have tag editor that have meta boxes to write my content (words that different in each post) and create tags with pattern (words and Sentences that is same in each post) that I wrote before .

for example:

pattern : tag/free-[$words]-learnings

that i fill the field by programing and result is :

tag/free-programing-learnings

in this example for apply place of [$word] should i need regular expression?

and how create pattern?

Is it possible to use plugin or components for execute this task?

thank you for give your heart.