[xsl] tokenize a string with escaped spaces

["Mark Giffin m1879@xxxxxxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>]

I am tokenizing an XML attribute that has info I need in it. Example:

myattr="ng-model=mymodel ng-show-mymodel=='Radio button 1'"

So I want to tokenize into these two values:

ng-model=mymodel
ng-show='Radio button 1'

Using white space like tokenize($attr, '\s') gives me this, not what I want:

ng-model=mymodel
ng-show='Radio
button
1'

Do you have a suggestion on how to do this? Doesn't have to use tokenize().

Thanks,
Mark