select 'example@email.com' ~ '^[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,}$'

select substring(
    'http://www.example.com/page' from '://([^/]+)'
) = 'www.example.com'

select 'www.example.net' ~ '\.org$'

select 'The quick brown fox' ~ '\mbrown\b'

select '192.168.300.1' ~ '^(\d{1,3}\.){3}\d{1,3}$'

select 'g3h4' ~ '^[A-Fa-f0-9]+$'

select '2023/04/01' ~ '^\d{4}-\d{2}-\d{2}$'

select '123-456-789' ~ '^\d{3}-\d{2}-\d{4}$'

select '(123) 456-7890' ~ '^\(\d{3}\) \d{3}-\d{4}$'

select 'abcxyz' ~ '[0-9]+'

select 'password' ~ '^(?=.*[A-Za-z])(?=.*\d)[A-Za-z\d]{8,}$'

select 'hello' ~ '^[A-Z]+$'

select 'abc_' ~ '^abc%'

select '123456' ~ '^\d{5}$'

select 'www.example.com' ~ '^https?://[a-z0-9.-]+(\.[a-z]{2,})+$'

select '1234-5678-9012-3456' ~ '^\d{4}-\d{4}-\d{4}-\d{4}$'

select 'image.png' ~ '\.pdf$'

select '' ~ '^\s+$'

select 'XYZ7890' ~ '^[A-Z]{3}-\d{4}$'

select 'abc-123' ~ '^[A-Za-z0-9]+$'