Re: XML::Twig and handles on regex/xpath

When debugging XPath expressions, I usually work my way up from the "deepest" tag I want to match. In your case, I'd first try to match things with a tagName matching /^tag\d+$/:

//*[starts-with(name(), "tag")]
[download]

Then, I'd slowly work my way upwards, adding more specific tags or rules in front of it:

//target/*[starts-with(name(), "tag")]
//result/target/*[starts-with(name(), "tag")]
[download]

Ideally, at the end, I can then remove the floating specifier:

/result/target/*[starts-with(name(), "tag")]
[download]

Maybe you need to change your expression, or maybe XML::Twig doesn't support the starts-with() function - then I'd try the direct regular expression approach. I really wonder though whether your usage of specifying regular expressions instead of XPath expressions is correct, as I wuold imagine that XML::Twig interprets your first expression as XPath expression as well. I'm not sure how self::1 is supposed to work in conjunction with tag, as I don't think that tag[EXPR] will ever match anything that doesn't have an explicit tagName of "tag".

Comment on Re: XML::Twig and handles on regex/xpath Select or Download Code

Replies are listed 'Best First'.
Re^2: XML::Twig and handles on regex/xpath by Eythil (Acolyte) on Apr 28, 2011 at 08:17 UTC
Thanks. Sadly, this also gives an 'unrecogniced expression' error. I assume Twig does not support this kind of xpath expression.	[reply]
Re^3: XML::Twig and handles on regex/xpath by Corion (Patriarch) on Apr 28, 2011 at 08:22 UTC
What gives an "unrecogniced expression" error? I posted three different XPath expressions. You have shown neither the Perl code you use, nor the input data you use nor the XPath expression you use, nor the error message you use. Please help us to help you better by providing us with the relevant information. Looking at the XML::Twig documentation, it recommends looking at XML::Twig::XPath for more XPath support.	[reply]
Re^4: XML::Twig and handles on regex/xpath by Eythil (Acolyte) on Apr 28, 2011 at 08:33 UTC
Actually I get the error message as soon as I try use the '`[starts-with(...)]`'. Thanks for pointing out XML::Twig::XPath. I will try to come up with a solution using this and post it here.	[reply] [d/l]
Re^5: XML::Twig and handles on regex/xpath by Anonymous Monk on Apr 28, 2011 at 08:49 UTC
Re^6: XML::Twig and handles on regex/xpath by Eythil (Acolyte) on Apr 28, 2011 at 09:04 UTC