Search Function

i have numerous tables to search through for a 'site search'. some of the searchble fields have html embeded within so after some quick referencing, saw I can use the regExp function to strip out all the HTML leaving only the raw text.

what is the best method to remove alot of words such as "a", "and", "I", "so", "that", "this" ...etc ... from the search string leaving only keywords essentially per page/field that will be searched within for the occurance
of the users' input text through a input field. The idea being to only return the suitable records without alot of rubbish.