Finding Multiline Comment in PHP
This page show a good regexp to find miltiline comment : http://ostermiller.org/findcomment.html
/*([^*]|[rn]|(*+([^*/]|[rn])))**+/
But in PHP the slash character must have been backslashed:
'/(/*([^*]|[rn]|(*+([^*/]|[rn])))**+/)|(//.*)/'
source: http://racztiborzoltan.blogspot.hu/2011/11/multiline-comment-regex-php-preg-re.html