Does not work on words split by formatting

[fakkoweb]

Here: https://www.listediparole.it/m/a/4/paroleconario.htm

You can try this regex:
.{1}ario
no word from the results will be highlighted.

It is probably because the formatting makes the searcher believe that each word result is actually two different words (separated by <b> tag). So that they are individually searchable.

Default Chrome search does not do this.