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Which three tasks can be performed using regular expression support in Oracle Database 10g？（）
A: it can be used to concatenate two strings.
B: it can be used to find out the total length of the string.
C: it can be used for string manipulation and searching operations.
D: it can be used to format the output for a column or expression having string data.
E: it can be used to find and replace operations for a column or expression having string data.

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出自：Oracle认证

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