Not sure where JSON is involved, what you show is not JSON.

To just remove the quotes in this case, you can do: 
$string = "90'+7'";
$string =~ s/'(\+\d+)'/$1/a;

[download]
(assuming it is always + not - and an integer). If it could happen more than once in your string, change /a to /ga.

If you mean you want the addition actually performed, leaving you with 97, do: 
$string = "90'+7'";
$string =~ s/(\d+)'(\+\d+)'/$1+$2/ae;

[download]
(assuming the first number is a not too large unsigned integer).

In reply to Re: strip out of single quotes by ysth
in thread strip out of single quotes by frank1

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