select trim(regexp_replace('123456', '...', '\& ', 'g'));
If you don't care about trailing space remove the 'trim()'.
The replacement string may need to be escaped differently depending
on your PG version and setting for standard_conforming_strings. For
example: E'\\& '
After combined with several more replace(s), regexp_replace will provide
me the expecting result.
Thanks!
Emi
--
select
regexp_replace(
replace(
replace(col-val, ' ', ''), '-', ''),
.... replace...
'(...)', E'\\1 ', 'g')
from tn;
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