How do you remove a Tag from and existing set of tags within a note?

[PaulWalters]

In addition to using a stamp, as suggested, an agent similar to the one described here works when you are sure you want the tag string in question removed everywhere.

A key atribute appeared in all my notes

I don’t know the name of the attribute in question, but let’s say it is “MyAttribute”. You can use an agent with the query $KeyAttributes.icontains("MyAttribute"); and with this action $KeyAttributes=$KeyAttributes.replace("MyAttribute",""); This agent will find all cases where KeyAttributes contains the attribute in question, and remove the attribute from KeyAttributes. The other KeyAttributes settings will remain intact. (After running once, and performing the action on all the query r…

Use the query suggested by @JFallows or use

$Tags.icontains("taxi")

since .icontains is case-insensitive

and use

$Tags=$Taxi.replace("Taxi","");

as the action for that agent. This sort of action is irreversible, so take care in its use. (The action can also be used in a stamp, if your removal action needs to be more granular as suggested above.