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REXML::XPath.first(element, path = nil, namespaces = {}, variables = {}) -> Node | nil (54454.0)

• 2.1.0

• 特異メソッド

element の path で指定した XPath 文字列にマッチする最初のノードを 返します。

...s[1] # => <a> ... </>
b1 = REXML::XPath.first(a, "b")
b1.text # => "b1"

REXML::XPath.first(doc, "/root/a/x:c") # => <x:c/>
REXML::XPath.first(a, "x:c") # => <x:c/>
REXML::XPath.first(a, "y:c") # => nil
REXML::XPath.first(a, "y:c", {"y" => "1"}) # => <x:c/>
b2 = REXML::XPath.first(doc, "/root/a/b[te...

• REXML::Element