Match a latex tag from todolist package?

In my latex document, I use todo commands like this:

```
\todo[inline, caption={Use more math}]{Use a little bit more mathematical notations here}
```

Where the format of the command is :

```
\todo[options]{todo text}
```

But I would be happy even if it extracted just the part following "\todo".

What would be the _prefix_ and _suffix_ definition for extracting these?

Thank you very much.
