regexp error blocking `make local`

[alecbw]

Getting a linting? error that blocks the make local

in /postgres/tasks/enable-remote-access.yaml

Stack trace

[WARNING]: No inventory was parsed, only implicit localhost is available
[WARNING]: provided hosts list is empty, only localhost is available. Note that the
implicit localhost does not match 'all'
ERROR! Syntax Error while loading YAML.
  found unknown escape character

The error appears to be in '/Users/Alec/Documents/Coding/Actual_Programs/de-devtools/playbooks/roles/postgres/tasks/enable-remote-access.yaml': line 5, column 35, but may
be elsewhere in the file depending on the exact syntax problem.

The offending line appears to be:

    path: /etc/postgresql/10/main/postgresql.conf
    regexp: "^#listen_addresses = \'localhost\'.*$"
                                  ^ here

The above was not in a container, but it was in a pipenv.
MBP Mid 2014
ansible 2.9.6
Python 3.7.7

the previous build/run workflow (below) still works just fine.

docker build -t de-devtools .
docker run --rm -it de-devtools /bin/bash