The solution depends on how your real world example off “hello.com” look like.
For just “hello.com” search for \w+\.com
Find: \w+\.com
[X] Regular Expression
\w+ >> one-or-more (+) of “Any word character” (\w)
\. >> literal dot
com >> literal ‘com’
Even just “\w+.com” will work, but can lead to unwanted results as we search for one any-sign (.) instead of a real literal dot (\.)
More at the help > EmEditor Home – EmEditor Help – How to – Search >>> Regular Expression Syntax