"Attach to Existing Content" popup search box pulling up records that don't match search query

[subrataemfluence]

I am not very sure whether this is really a bug in WordPress core but today I encountered it accidentally.

I was Attach-ing an image from media library to an existing post. I typed in a search query (10 thing) in the search box and hit submit. Multiple records came up, while I was expecting only one which has the phrase in its title and content body. None of the other posts which appear along with, is associated with the search phrase. I checked title, body, and meta values for this post.

But when I searched with 10 things (added an "s"), I got the desired result, i.e. only a single post.

I have no third party plugin installed in my system. It is a clean install and everything is up to date.

[SergeyBiryukov]

It's likely that the found posts contain thing somewhere in content.

The search is supposed to return all the relevant results, not just strict matches, see #7394 for details. I don't see anything wrong here at a glance.

[aubreypwd]

Found that even though one of the posts had "thing" in the content, searching for "10 thing" did not yield the "This has the word th#ing in the content." I suspect it was actually the "10" keyword bringing up those other results.