How to split string to array by individual characters?

Postgres has too many features, so sometimes is good to remind some.

Function string_to_array is well known. This function has two or three parameters. If second parameter (delimiter) is null, then input string is separated to array of characters.

postgres=# select string_to_array('Pavel Stěhule',null);
┌───────────────────────────────┐
│        string_to_array        │
╞═══════════════════════════════╡
│ {P,a,v,e,l," ",S,t,ě,h,u,l,e} │
└───────────────────────────────┘
(1 row)

compiled dll of plpgsql 1.6 for PostgreSQL 10, 11

Adam Bartoszewicz prepared dll. Please, read a message.

Thank you, Adam

pspg is available in Fedora 29, Fedora 30 repository

If you use fresh Fedora distribution, you can install a pspg pager very simply:

dnf install pspg

after this:

export PSQL_PAGER=pspg #for Postgres 11 
export PAGER=pspg
psql dbname