（多选题）
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.
正确答案
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