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[]*] # What about this?! valid
[:*096] # invalid: 096 isn't a valid octal number
a [:*0] # as many colons as string1 was long (not to be confused
# with a character class)
[:*] # ditto
[:*016] # 14 colons
[=]=] # valid: equivalence class containing ']'
[-a # valid, assuming `[' is before 'a' in collating sequence
-] # valid, assuming ` ' is before ']' in collating sequence
--] # valid, assuming `-' is before ']' in collating sequence
\0-\377 # valid
[\0-\377]# valid, (but brackets will be mapped to corresponding chars
# in other string)
abcde[:* # valid, but none of the characters is considered special
abc xyzdef # Should this (str2 longer than str1) evoke a warning?
# Probably so if we're only translating, but if also deleting or
# squeezing this makes sense.
abcdef : # Map abcdef all to `:', as if str2 had been [:*]
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