reg expressions- please help!!!!!1

Hello Guys I need some help, i am trying to use regular expressions in php to query a Mysql database( obviously flights tables). the idea is to provide a a search tool for the users to type in flight searchs, eg. when is the next flight from London heathrow to Manchester or how much is a flight from London Gatwick to Manchester. etc can some help with some ideas or sql queries i can use to query my database and then provide an appropriate answer or response to eaach query Thank you in davance for your help -- Jonathan Trepczyk