Android : Removing string using start and end values

I have a string that I want to remove a section from.

The section I want to remove starts in <img width and ends with the first instance of />

I want to remove this whole img tag completely.

I've got the following but it requires an entire string to remove whereas I only have the start and end, as the middle changes.

String string = var.replace("string to replace but dont have entire", "");