(autoconf.info)Shell Pattern Matching
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10.5 Shell Pattern Matching
Nowadays portable patterns can use negated character classes like
`[!-aeiou]'. The older syntax `[^-aeiou]' is supported by some shells
but not others; hence portable scripts should never use `^' as the
first character of a bracket pattern.
Outside the C locale, patterns like `[a-z]' are problematic since
they may match characters that are not lower-case letters.
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