So, how does your script fail? We are not mind readers, and if you don't tell us, it makes it much harder for us to find out whether we are seeing the same issues that you see.
As a side-note, I think it's unwise to use @ as a delimiter for your filter when @ is quite prone to also occur within the output you are constructing. I would rather use here-documents or some escapement scheme.
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Want more info? How to link or
or How to display code and escape characters
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