Re: regular expression question

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But how? The +[a-z]{2,} seems to allow at least two a-z clusters, but it doesn't include a period. /ml

Almost correct. The plus belongs to whatever comes before it, not after. So what you're referring to as matching two or more characters but not the period, is this:

[a-z]{2,}

And this will match one or more  "subdomains":

([-a-z0-9]+\.)+

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