How does {m}{n} (“exactly n times” twice) work?

Question

So, some way or another (playing around), I found myself with a regex like \\d{1}{2}.

Logically, to me, it should mean:

(A digit exac

Answer 1

At first I was surprised this doesn't throw a PatternSyntaxException.

I can't base my answer on any facts, so this is just an educated guess:

"\\d{1}"    // matches a single digit
"\\d{1}{2}" // matches a single digit followed by two empty strings