Searching XML Feeds for Keywords

[dahuk]

All,I'm building a site which will gather news stories from about 35 different RSS feeds, storing in an array. I'm using a foreach() loop to search the title and description to see if it contains one of about 40 keywords, using substr() for each article. If the search is successful, that article is stored in a DB, and ultimately will appear on the site.The script runs every 30 mins. Trouble is, it takes 1-3 mins depending on how many stories are returned. Not 'terrible' but on a shard hosting env, I can see this causing plenty of issues, especially as the site grows and more feeds/keywords are added.Are there any ways that I can optimize the 'searching' of keywords, so that I can speed up the 'indexing'?Thanks!!