It looks like LanX has the correct answer. After shell quoting, that line would be: $result = ; which surely isn't what you intended.

Also, you check @ARGV in the embedded script, but don't pass any arguments to it. You should add "$@" after the last single quote to pass the arguments to the function. i.e.:

function fConvert {
   perl -e '
   ...<snip>...
   ' "$@"
}
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