I have the following HTML:
<html>
<head>
<meta http-equiv="refresh" content="0;URL=http://amazingjokes.com" />
</head>
</html>
I want to find the META with the redirect, so I wrote the following XPath query:
/html/head/meta[@http-equiv="refresh"]
However, the '-' in 'http-equiv' is causing an error:
Invalid regular expression: //html/head/meta[@http-equiv="refresh"]/:
Range out of order in character class
How can I properly rewrite the xpath query to be able to find the meta redirect?
I experimented with this, when I remove the '-' from the HTML code and the query things work as expected, but unfortunately the 'http-equiv' is a set standard, so I can not change that. This experiment showed me I am very close...
However, the '-' in 'http-equiv' is causing an error:
Invalid regular expression: //html/head/meta[@http-equiv="refresh"]/:
Range out of order in character class
Obviously, the XPath engine you are using is buggy.
The XPath expression used in the question is a valid XPath 1.0 expression and it selects the wanted <meta> element.
Here is an XSLT - based verification:
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output omit-xml-declaration="yes" indent="yes"/>
<xsl:template match="/">
<xsl:copy-of select="/html/head/meta[@http-equiv='refresh']"/>
</xsl:template>
</xsl:stylesheet>
When the transformation above is applied on the provided XML document:
<html>
<head>
<meta http-equiv="refresh" content="0;URL=http://amazingjokes.com" />
</head>
</html>
the XPath expression is evaluated and the selected in this evaluation node is output:
<meta http-equiv="refresh" content="0;URL=http://amazingjokes.com"/>
