How to insert random keywords into article?

[bluescharp]

I want to insert random keywords into article in random position.
I don't care if article can be readable, i just want to do it efficiently.
Maybe i should do it in C#, but i don't know how to code it.
Thanks.

 

[rostonix]

Replace something like this as regex with your keyword

(?<=\b)\w{5,7}(?=\b)