I noticed that regexp_matches already returns the rows which matches the
regular expression
now when I make a full table select query
but if I make a search with regexp_matches, it only returns rows that
matches regular expression
on pgadmin the column type is shown as text[] thus I also do not understand
why array_length on where condition does not work for this.
But maybe as it was pointed out, the return type is setof text[], that the
result could have been like this (one row of data may result in multiple
rows)
If you have a regular expression that may end in one or more elements in the
text[] then you may use inner query
ps: last query is pointless as it will return 2 elements for each row (that
matches the regular expression), but there may be a regular expression that
may return one or more elements for each row
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