I am perplexed by an expression I have come across in a tutorial. To find duplicate paragraphs, it is given as




In place of the \1, other possibilities are given, such as {2}.

I don't understand how this expression for any paragraph (the asterisk) becomes identifiable as a specific paragraph, since it lacks any specifications.

Perhaps understanding this will assist my continued learning of how to employ F&R wildcard expressions in new situations.

Thank you.