context based search

[alwz_nikhil]

Any one has solution for context based search?
Like Google does, it highlights the keyword which is searched..

For eg.
If im searching for "keyword"
results should come in folowing manner...

Keyword - Wikipedia, the free encyclopedia
A keyword is a word or concept with special significance, in particular any word used as the key to a code or used in a reference work to link to other ...

Google AdWords: Keyword Tool
Use the Keyword Tool to get new keyword ideas. Pick one of the tabs below and enter keywords or URLs that are relevant to your business. Keyword Tool Tips ...

Any suggestion how to achieve this ?

[roots]

I am not sure whether this searching feature is called context based searching or not.

Search on the content of Hit itself using regex.. find the appropriate sentence containing the terms searched ..

There must be better ways as well for this ..