PHP regexp match slash

Question

I have the following regular expression tested at regex101 and it works there. However, when I try to use it inside the preg_match it doesn't work anymore. The problem is the slash: I tried escaping it but I can't get it working.

preg_match("/[<>\\\"'%;()&]/", "my\string");

The set of characters that I should match are:

< > \ " ' % ; ( ) &

Answer 1

Simply use a different delimiter:

preg_match("![<>\\\"'%;()&/]!", "my\string");