Name

ORA-12726: unmatched bracket in regular expression

Synopsis

You have mismatched square brackets in your expression. Apply the advice we give for ORA-12725, but this time look at your use of square brackets. Also, while an expression such as '[a' will cause this error, an expression such as 'a]' will not, because a closing (right) bracket is treated as a regular character unless it is preceded by an opening (left) bracket.

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