Special character on the Subject line

I need to extract a number from the subject line where Subject line is
something like that:

Some text (Customer #12345679)


My current recipe is the following:

:0
 * ^Subject: .*Customer # ()\/[0-9]+
 * MATCH ?? ^^\/[0-9]+
 { CUST_NO = $MATCH }


It doesn't catch this number. Does anybody have any ideas how to fix it?

Thanks



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