Postgresql sorting mixed alphanumeric data

You can simply cast name column to bytea data type allowing collate-agnostic ordering:

SELECT name
FROM folders
ORDER BY name::bytea;

Result:

     name     
--------------
 a test
 alphanumeric
 test 1
 test 10
 test 19
 test 20
(6 rows)

All of this methods sorted my selection in alphabetical order:

test 1
test 10
test 2
test 20

This solution worked for me (lc_collate: 'ru_RU.UTF8'):

SELECT name
FROM folders
ORDER BY SUBSTRING(name FROM '([0-9]+)')::BIGINT ASC, name;

test 1
test 2
test 10
test 20

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