Why is "find" on OSX having trouble with regex?

Question

find -E . -type f -iregex ".*Diss.*\.tex" -exec basename {} +

or

find -E . -type f -iregex "(.*/).*Diss.*\.tex" -exec basename {} +

finds ALL files with extension .tex, but does not limit their names to Diss*.tex

Is it OSX malfunctioning, or is the regex wrong?

Answer 1

The .* pattern matches any 0 or more chars, hence the Myfile may appear in any part of the path. See your regex demo:

You may restrict the Myfile to only appear after the last / if you replace those .* at the end with [^/]* matching any 0+ chars other than /.

The pattern will look like

.*/[^/]*Myfile[^/]*\.tex

Here is a demo of what it will match.