Andrea Giudiceandrea wrote
> array_length(
> array_distinct(  
> string_to_array(
> substr(regexp_replace( "pippo",'(.)',',\\1'),2))))

ciao,
si puo' evitare anche l'uso della funzione substr:

array_length(
array_distinct(  
string_to_array(
regexp_replace( "field",'(.)\\B','\\1,'))))

w regex

https://regex101.com/r/XkpsXl/1/



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