I suspect that by "node" you mean "element node".
//*[.='dipsut']
will return all the element nodes whose content is the string 'dipsut'
//*[contains(text(),'dipsut')]
will return all the element nodes whose content contains the string 'dipsut', within a single text node child of the element node.
Michael Kay
http://www.saxonica.com/
Author, XSLT Programmer's Reference and XPath 2.0 Programmer's Reference