Regex: POSIX

[:upper:]Upper case letters
[:lower:]Lower case letters
[:alpha:]All letters
[:alnum:]Digits and letters
[:digit:]Digits
[:xdigit:]Hexade­cimal digits
[:punct:]Punctu­ation
[:blank:]Space and tab
[:space:]Blank characters
[:cntrl:]Control characters
[:graph:]Printed characters
[:print:]Printed characters and spaces
[:word:]Digits, letters and underscore

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