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Some query examples for copy & paste ;-)
SELECT * FROM h1
^ select all <h1> tags
SELECT * FROM a
^ select all links
SELECT * FROM td
^ select all <td>'s
SELECT href as url, text FROM a
^ return href as url and text as text from all links
SELECT * FROM a WHERE preg_match("/^http:\/\//", $href)
^ find all external links
SELECT * FROM a WHERE preg_match("/^\/snippets/i", $href) and preg_match("/^array_/i", $text)
^ find all links starting with /snippets and with a link text starting with "array_"
SELECT * FROM *
^ select all attributes of all tags ;-)
SELECT id, name, password FROM user WHERE $status == "active"
^ select all <user> tags where status="active" (for XML files)
SELECT * FROM * WHERE $id == "header"
^ return all tags with the $id = header
SELECT * FROM a WHERE substr($href,0,1) != "/"
^ select links with URLs that start with / (mainly internal links)
SELECT * FROM * WHERE $class == "nav_item"
^ select all tags with the class = nav_item
SELECT * FROM a WHERE ($href == "foo.htm" and $title == "foo") or ($title == "bar")
^ complex query
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