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zshis a good suggestion IMHO... I had no idea! 2. I generally use the "Unicode" alphabet in my filenames (e.g. é ç); doeszsha-zinclude those characters? 3. However... from strictly a file system perspective, I wonder if it might be "better" to convert to ASCII? Oh - please don't feel compelled to modify your answer; this comment is for my own benefit as much as anything else :)[a-z]only matches the 26 ASCII lower case letters. Elsewhere, YMMV. Some will includeçorπ, some will include multi-character collating elements (which would throw off your count) some won't. Most won't includeZzΕΉΕΊΕ»ΕΌΕ½ΕΎαΆ»α·¦αΊαΊαΊαΊαΊαΊβ€β¨β΅ββ©οΌΊο½ππ³ππ§πππ΅ππ©ππ·π«π ππΉππππ‘π»ππ―ππ£π©π π ©πas they sort afterz.[[:alnum:]]. For latin alphabet letters only, includingΕΊ,æandç, best is probably to useperland its\p{latin}match by character property. Not available in PCRE, so not in zsh's[[ -pcre-match ]]unfortunately.[[=a=][=b=]...[=z=]]in some regexp and glob engines (not zsh globs, but will work with its[[ =~ ]]ifrematchpcreis not enabled and the system's ERE support it), could be another approach.