How to query a string that is longer than X amount of characters or that is missing full-stops in Solr 7?

Question

I would like to query in my Solr 7 interface core those strings that are longer than 30 characters.

OR identify the string results that are missing full-stops.

How can I do this ?

Query: search strings that are missing full-stops/periods "."

q=fieldname: -*.*