word complete goes to far

[Leo]

hi all,

in isearch, when i use Ctrl-w to complete the search to the underlying word,
emacs goes to far when there are quotes in voled:

ig. in the text there is the quoted term 'Peter'. i place the cursor on the
P and press Ctrl-s Ctrl-w. then emacs searches for peter' (note the single
quote at the end!).

that's not what i want.obviously i want to search just for peter.

how can i tell that emacs?

thanks for any advice,

leo