Using a literal asterisk in AuthorizationPolicy rules

So, in Istio / Authorization Policy is specified that an asterisk (*) character can be used to specify prefix, suffix and presence matches and that is great.

We are now in a situation on which we need to specify a single asterisk character as an exact match (not a presence match) but I failed so far to find any information about how to “escape” the asterisk to avoid it to be interpreted as a presence match.

Any pointers about how to solve this would be greatly appreciated.

PD: I tried to find the source code for the logic that evaluates this patterns (to see if there is some pattern escaping mechanism in place) but could not find it, so if anyone can share a pointer to this logic it would be appreciated too.