While other search providers like Bing and Yahoo try to catch up with Google, Google keeps throwing out cool features like cleaner interface and more intuition.
The search filters can really be made to look complex and the search results more precise using ‘regular expressions’ (regexp).
The search filters that I most frequently use are:
“filetype:file extension” – Very useful if I am trying to look for content in a specific format
“site:” – Faster if I am searching for some article or information in a huge website like techtarget.com itself.