What separator should be used for the string_to_array command in PostgreSQL for tab separated text?

Question

I am querying a single column table, the query output is of text type. I want to check the power of the results. I use the command string_to_array, but I do not know what I need to put for the delimiter. The following two commands do not work:

select rec from papers_stg where cardinality(string_to_array(rec,'    ')) <> 11
select rec from papers_stg where cardinality(string_to_array(rec,'\t')) <> 11

Here are the first two lines of table papers_stg:

7B5EDC52        Antibacterial Activity and Post-Antibiotic Effect of Flurithromycin Compared with Other Macrolides and Penicillins Against Periodontal Pathogens        antibacterial activity and post antibiotic effect of flurithromycin compared with other macrolides and penicillins against periodontal pathogens        2013    2013/07/18      10.1179/joc.2001.13.3.255       Journal of Chemotherapy journal of chemotherapy 0794F580                19555
7932AE5F        In Vitro Activity of Cefdinir against Respiratory Pathogens Isolated in Sicily with Reference to Beta-Lactamase Production      in vitro activity of cefdinir against respiratory pathogens isolated in sicily with reference to beta lactamase production      2013    2013/07/18              Journal of Chemotherapy journal of chemotherapy 0794F580                19555

And here is the description of the table:

 Table "public.papers_stg"
 Column | Type | Modifiers 
--------+------+-----------
 rec    | text | 

Answer 1

String constants with C-style styles

string_to_array(rec, E'\t')