Question

I have something like this:

UPDATE table SET column=REGEXP_REPLACE(column, E'\[(.*)\]$', '');

Everything is ok with this query, but the problem exists when I want to do this from console, like here:

psql -U postgres db -c "UPDATE table SET column=REGEXP_REPLACE(column, E'\\[(.*)\\]$', '');"

I think there is a problem with escaping some characters, but I cannot handle it.

Answer 1

Assuming a Unix-like shell, as an alternative to passing the query with -c and complicated multi-level quoting, it could be passed in its original form in the standard input using heredoc syntax:

$ psql db << EOF
UPDATE table SET column=REGEXP_REPLACE(column, E'\[(.*)\]$', '');
EOF