c# regular-expression search format the search prase if boolean and or not prese

Question

hi,

i need to do search engine, its like string matching, if the search string consists of boolean text like AND,OR,NOT i have to format the search string according to the boolean logic..

eg:- search string is sachin and lara or ponting, now i have to format the string without boolean keywords but the it accepts the and,or,not logics.

http://www.csa.com/help/Search_Tools/boolean_operators.html

please help me..

Thanks in advance