[feature] Ability to rewrite content / apply regex or remove words before change etc /

**Version and OS**
v0.45.7.3

**Is your feature request related to a problem? Please describe.**
I'm monitoring a site which has a "numbered" news section. It's not really numbered but it uses an `

` html element which causes your snapshot to show it numbered.
The problem is that every time a new line is added, instead of seeing 1 addition, the entire list changes because every line now has a different nubmer

**Describe the solution you'd like**
Either completly ignore numbers or provide an option to ignore them.
Another option is to allow me to provide a regex which you'll use to **delete** stuff from the page this way I'll just delete all `/\d+\./` strings