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Can I search by UserName AND Tag? Eg: All my posts about series-seq?
The search: [sequences-and-series] user:JackOfAll
returns 30,000 results!
That's right. You can't use user:JackOfAll. What happens if you change your username?
Instead, you can search by a userid, which is the number you see in the search box when click on a user's profile.
If you're interested in your own posts, you can use user:me instead.