Perhaps spaces are unnecessarily restricted

Copy SQL

WITH text_domains_with_checks AS (
SELECT cdu.table_schema, cdu.table_name, cdu.column_name, d.data_type, d.character_maximum_length, cc.check_clause
FROM INFORMATION_SCHEMA.column_domain_usage AS cdu INNER JOIN INFORMATION_SCHEMA.tables AS t USING (table_schema, table_name)
INNER JOIN INFORMATION_SCHEMA.domain_constraints AS dc USING (domain_schema, domain_name)
INNER JOIN INFORMATION_SCHEMA.check_constraints AS cc USING (constraint_catalog, constraint_schema, constraint_name)
INNER JOIN INFORMATION_SCHEMA.domains AS d USING (domain_schema, domain_name)
WHERE t.table_type IN ('BASE TABLE', 'FOREIGN')
AND  d.data_type LIKE '%char%'
AND cc.check_clause NOT LIKE '%IS NOT NULL'  
AND cdu.table_schema NOT IN (SELECT schema_name
FROM INFORMATION_SCHEMA.schemata
WHERE schema_name<>'public' AND
schema_owner='postgres' AND schema_name IS NOT NULL)),

text_columns_with_checks AS (SELECT 
(SELECT nspname FROM pg_namespace WHERE oid=c.relnamespace) AS table_schema,
c.relname as table_name, 
a.attname AS column_name,
t.typname AS data_type,
a.atttypmod-4 AS character_maximum_length,
substring(pg_get_constraintdef(o.oid),7) as consrc
FROM pg_constraint o INNER JOIN pg_class c ON c.oid = o.conrelid
INNER JOIN pg_attribute a ON a.attrelid = c.oid AND a.attnum = o.conkey[1] AND a.attisdropped = FALSE
INNER JOIN pg_type t ON a.atttypid=t.oid
WHERE cardinality(o.conkey)=1 AND o.contype = 'c'
AND t.typname in ('bpchar','char','varchar')
UNION SELECT table_schema, table_name, column_name, data_type, character_maximum_length, check_clause
FROM text_domains_with_checks)

SELECT table_schema, table_name, column_name, data_type, character_maximum_length, consrc
FROM text_columns_with_checks
WHERE consrc~'\^[^\. ]*\$'
AND consrc!~'(\\s|\[\[:space:\]\])(\*|\+)'
AND column_name~*'(nimi|nimetus|kirjeldus|selgitus|kommentaar|name|description|comment)'
ORDER BY table_schema, table_name, column_name;