A knob to turn on string splitting

It would be nice to have a knob for turning this:

mystr = "A really long string that is going to go over the character limit, but as I'm writing this I forget to create a line break"

into this:

mystr = "A really long string that is going to go over the" \
" character limit, but as I'm writing this I forget " \
"to create a line break"

Especially when the string is surrounded by brackets. These two are semantically equivalent (with the backslash), and the second is much nicer.