Is there a way to search for something that exists in just the questions I have posted on Mathematica Stack Exchange?
Let me summarize what I said in the comments.
In order to search within a certain user's posts, you can use their user ID together with the
user search key in StackExchange's search. You can get the User ID from the link to the user's profile in any of their posts.
For instance, hovering over David's name at the bottom of his question above shows that his user ID is 5183, so using
user:5183 will return all his posts (questions and answers; the link performs a search on the main MMA site).
The user ID is shared between each site and its Meta counterpart, but not throughout StackExchange, so the same user will have different user IDs on e.g. MMA.SE and math.SE.
If you wants to search your own contributions, you can also use the simpler form
user:mine as a search term.
You can also differentiate between question and answer posts by using the
is: tag in search:
is:qfor questions only
is:afor answers only
Thanks to halirutan for mentioning the single-letter short forms above!
Here are a few examples of search tags that I find myself using very often:
created:1d..will list posts created in the last 24 hours; the function also takes closed ranges, and specific dates.
hasaccepted:(y/n) shows questions that have/do not have accepted answers.
For instance, I recently used the following search string to locate questions from last October that had people had found interesting (score=5 or higher), that were not duplicates, that were still open (
closed:no migrated:no), that had not been tagged as bugs (
-[bugs]), but that nonetheless had not received any answers:
-[bugs] created:2014-10-01..2014-10-31 is:question duplicate:no closed:no migrated:no score:5.. answers:0
For further search terms, take a look at this page: How do I search?