Pipe character error

I have an error with some code being executed. When I use a pipe character | in my code as a delimiter, the code is displayed on the screen as text and not executed.

For example:

$variable = "1600 Pennsylvania Avenue, Washington, D.C. | 220 Main Building, Notre Dame, IN 46556";

I tried escaping the character ‘\|’, but that did not work. At this point, I am unsure if I can get around the problem. Do you have any suggestions?

Thank you.

https://wordpress.org/plugins/insert-php/