No you cannot.
But look at this for a pointer:
select 'hi' || (select substring('hello1234567890' from '[0-9]+$'))
where 'hello1234567890' ~* '[a-z]+([0-9+])';
CSN wrote:
>Can you use backreferences in regular expressions like
>so?
>
>update table set title='foobar ' || \1 where title ~*
>'[a-z]+([0-9]+)';
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> joining column's datatypes do not match
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