Question

The expression /bookstore/book[1]/title should return <title lang="eng">Harry Potter</title> but instead I get “The regular expression does not match…”

Here is my XML that I am testing:

<?xml version="1.0" encoding="ISO-8859-1"?>

<bookstore>

<book>
  <title lang="eng">Harry Potter</title>
  <price>29.99</price>
</book>

<book>
  <title lang="eng">Learning XML</title>
  <price>39.95</price>
</book>

</bookstore> 

Answer 1

While RB can handle regular expressions for XPath, but it doesn’t handle XPath paths.
For constructing/checking what’s selected etc of XPath paths you’d need something like XPath Explorer, Firefox with Firebug+Firepath, or similar.