bold, italic problems on partial text style

when we try to do bold something on the text like this;

this is a partial bold text

we should write;

this is a partial bold t*ex*t

and the output for this is like the code above.

the same problem is in many of them, like url;

this is a partial link

we write;

this is a partial l"in":xyzk

as you can expect, there won't be a link transform as we expected. so there must be an optional splitter character to use between the transforms and our non-styled/linked text. like "[]" for example as a splitter(of course it can't be used, it's a commonly used character couple);

this is a partial l["in":xyz]k