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However, regular expression implementations can encompass a wide variety of languages with characteristics that are very different from western European text. Oracle's implementation of regular expressions is based on the Unicode Regular Expression Guidelines. The REGEXP SQL functions work with all character sets that are supported as database character sets and national character sets. Moreover, Oracle enhances the matching capabilities of the POSIX regular expression constructs to handle the unique linguistic requirements of matching multilingual data.
Therefore, ranges in regular expressions are meant to be linguistic ranges, not byte value ranges, because byte value ranges depend on the platform, and the end user should not be expected to know the ordering of the byte values of the characters.