'How to replace " into space or delete first and last symbol?

I get xml data and I get value from it.

I need to delete symbols [ and ]

Here is my code, that gives me error about undegined variable:

         @xml = XmlSimple.xml_in(res.content)//here I get xml document
         payKey = @xml["payKey"]//gere I get needed value
         //it looks like "[some character]" so I need to delete [ and ]
         //I tried
         payKey = @xml["payKey"].to_s()//to use tr method
         payKey = payKey.tr("[]", "")//replacing
        redirect_to "https://svcs.sandbox.paypal.com/AdaptivePayments/Pay?cmd=_ap-payment&paykey=#{paykey}"//inserting into url

and result:

            svcs.sandbox.paypal.com/AdaptivePayments/Pay?cmd=_ap-payment&paykey="AP-7NK73769LH704515X"

So I need to delete " signs. Can someone help me ?

ruby-on-railsstringcharacter


Solution 1:[1]

My answer:

payKey = payKey[1..20]

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Source: Stack Overflow

Solution Source
Solution 1 vinzee

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