From: Phlip <phlip2005@...>
Date: 2009-03-19T04:37:25+09:00
Subject: Re: REXML get specific element

7stud -- wrote:

> That doesn't work for me.  And I couldn't figure out the escaping 
> necessary to handle both a name entered with a single quote or a double 
> quote.  I thought I understood ruby escaping, but not anymore.

You understand Ruby escaping - just not XPath escaping. There is none. If you 
use ' to delimit a string, you cannot use ' inside it. I would love to be proven 
wrong, but I did research this for quite a while.

Why didn't my $name substitution work? It's in the rdocs...

> f = File.new('xml4.xml')
> doc = Document.new(f)
> 
> input_name = gets
> input_name = input_name.chomp
> 
> target = XPath.match(doc, "//programmer[text() = 'John']")
> puts target[0].attributes["age"]

Wouldn't this work?

target = XPath.match(doc, "//programmer[text() = $name]", :name => $john)

> input_name = input_name.gsub("'", "\\'")
> p input_name
> 
> --output:--
> "Joh'n"
> "Johnn"
> 
> Can anyone explain what's going on there?

XPath does not escape ticks with \.