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Oracle® Database SQL Language Reference
11g Release 1 (11.1)

B28286-07
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Regular Expression Operator Multilingual Enhancements

When applied to multilingual data, Oracle's implementation of the POSIX operators extends beyond the matching capabilities specified in the POSIX standard. Table C-2 shows the relationship of the operators in the context of the POSIX standard.

Oracle lets you enter multibyte characters directly, if you have a direct input method, or you can use functions to compose the multibyte characters. You cannot use the Unicode hexadecimal encoding value of the form '\xxxx'. Oracle evaluates the characters based on the byte values used to encode the character, not the graphical representation of the character.

Table C-2 POSIX and Multilingual Operator Relationships

Operator POSIX BRE syntax POSIX ERE Syntax Multilingual Enhancement

\

Yes

Yes

*

Yes

Yes

+

--

Yes

?

Yes

|

Yes

^

Yes

Yes

Yes

$

Yes

Yes

Yes

.

Yes

Yes

Yes

[ ]

Yes

Yes

Yes

( )

Yes

Yes

{m}

Yes

Yes

{m,}

Yes

Yes

{m,n}

Yes

Yes

\n

Yes

Yes

Yes

[..]

Yes

Yes

Yes

[::]

Yes

Yes

Yes

[==]

Yes

Yes

Yes