I've seen these used in compilers for matching keywords - it's usually a small list of words but used so often in tokenising that it can be worth the bother. I'

I've seen these used in compilers for matching keywords - it's usually a small list of words but used so often in tokenising that it can be worth the bother. I've used gperf to (unsuccessfully) improve a key dictionary in python, but it turns out the default dictionary implementation is pretty good so the extra hassle wasn't worth the bother.