This is one of the things that Stack Overflow and the rest of the sites that run on this platform do very well. As soon as you try to create a new question, a little window is shown that shows other similar questions. How is this done? What technology can be used to achieve this? Lucene, Sphinx, ...?
kprobst
来源：https://stackoverflow.com/questions/5208130/how-does-stack-overflow-display-similar-questions-when-you-type-in-a-new-questi