Move hyphen in regexp for better compatibility #468
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In some versions of PHP (and/or PCRE) the hyphen has to be escaped or moved at the end of the regexp class to be considered as the literal '-' character. More info: https://stackoverflow.com/questions/24764212/preg-match-compilation-failed-invalid-range-in-character-class-at-offset#comment38430767_24767090
Tested on Wordpress 5.3 with PHP 7.4.