[php-52971] Port fix for PHP bug #52971

https://bugs.php.net/bug.php?id=52971
- Fixed bug #52971 (PCRE-Meta-Characters not working with utf-8)
#   In  PCRE,  by  default, \d, \D, \s, \S, \w, and \W recognize only ASCII
#       characters, even in UTF-8 mode. However, this can be changed by setting
#       the PCRE_UCP option.