Must be a bug or something. Whether I escape them or not, it will not work. No matter what I set the minimum and maximum to nothing gets caught. For instance:
find / -regex "/.{0, 50}." -maxdepth 1 or find / -regex "/.\{0, 50\}." -maxdepth 1 should pretty much catch everything residing within the filesystem root directory, but in either case it finds nothing.
According to the man page on my system (SuSE) the default is emacs. I'm not sure how emacs treats this syntax, but it seems not to be what you want.
The man page indicates that it must appear before the -regex option on the command line.
---------- Post updated at 15:17 ---------- Previous update was at 15:14 ----------
I also noticed when I cut/pasted your command that you have a space between the comma and the 50 which might cause a problem. I'd remove the space such that it is {0,50}
That's too bad. I'm not sure what your options are for updating tools, but using the AT&T Labs-Research AST tool set might be an easy option. It is pretty easy to download and build, and it's version of find supports the regex option as you expected without the type qualification.