From: Warren Brown <warrenbrown@...>
Date: 2005-10-19T01:26:59+09:00
Subject: Re: Expression Interpolation from input "template string"?

Peter,

> What I don't know is how to get the interpolation to
> work when the string is read from teh database as if :
>
> x = 'Hello, today is #{msgDate}'

    The easiest way to do this is to #eval() the string with quotes
around it:

irb(main):001:0* s = 'This is #{a} test.'
=> "This is \#{a} test."
irb(main):002:0> a = 'one'
=> "one"
irb(main):003:0> eval("\"#{s}\"")
=> "This is one test."

    If you're like me, you'll want to use a quoting method prettier than
\" inside the string:

irb(main):004:0> eval("%{#{s}}")
=> "This is one test."

    I hope this helps.

    - Warren Brown