fixes https://github.com/TryGhost/Ghost/issues/18133
Before, Sodo Search was not escaping search input before using the search terms in a regular expression, so using special characters could result in an invalid regular expression which would crash JavaScript.
As regular expressions date back to Perl, so does a standard solution for this, which called quotemeta in Perl. It doesn't exist 1:1 in JavaScript, but StackOverflow had the answer: stackoverflow.com/questions/6318710/javascript-equivalent-of-perls-q-e-or-quotemeta
So a line of code is added to escape the special characters in the regex for passing them through. This is the same code that the quotemeta module on NPM would use.
7fa083d774
