> yes, and for complexity:
>
> $field =~ /^([1-9]\d?)\.{2}\1$/;
I know you said that's untested, but I don't think it's correct.
You're saying:
1. ^ - Start
2. ([1-9]\d?) -Any character 1-9 followed by zero or one digit characters.
3. \.{2} - Two periods.
4. \1 - The same sequence of characters as in #2. (\1 references the
actual parenthetical match, not the expression.)
5. $ - The end.
So your expression would match things like:
1..1
11..11
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