algorithm regex

something mind: i put few strings in, algorithm shows me relating regex.

is there an "easy" proceed this, does something already exist?

edit 1: yes, i'm perplexing proceed beget regex.

edit 2: regulazy i am looking for. common formula i wish repremand regex; example, essay numbers:

• i put 123456, regex should \d{6}


• i put nb-123456, regex should \w{2}-\d{6}