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py超级菜鸟2013-03-10 23:26
Within a character list, a "range expression" consists of two
characters separated by a hyphen. It matches any single character that
sorts between the two characters, using the locale's collating sequence
and character set. For example, in the default C locale, `[a-dx-z]' is
equivalent to `[abcdxyz]'. Many locales sort characters in dictionary
order, and in these locales, `[a-dx-z]' is typically not equivalent to
`[abcdxyz]'; instead it might be equivalent to `[aBbCcDdxXyYz]', for
example. To obtain the traditional interpretation of bracket
expressions, you can use the C locale by setting the `LC_ALL'
environment variable to the value `C'.
