Quote:
Originally Posted by WS64
I never tried those since I never saw a reason to use them...
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They're great, since they cover your unicode characters too, for example you dont have to add ä,ß, etc - they are already understood to be lowercase.
[a-zäöüß] will all be captured by [[:lower:]], as well as a load more of edge cases which you might not have thought of. Saving you time, making edits more complete. The punct class is also especially useful - and very often overlooked.
The more you know!