It works on the basis that the bit you want to extract always has &profile= directly in front of it, which it uses to tell the formula where to start picking the text from.
It also relies on either the URL ending after the bit you want to extract, or there being a & directly after it.
remember find is case sensitive.
I picked 20 characters for the string returned by search just because I didn't want it to go to the end if it didn't need to.
I'm also relying on the fact that if it's not got a & it will be the last thing in the string.
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