jQuery contains() with a variable syntax

Question

I have an \"uncaught exception: Syntax error, unrecognized expression: )\" in a jQuery application.

The code is:

Answer 1

I have used this answer in order to solve a similar problem.
I want to prevent the use of " and '

When using $("p:contains('" + valor + "')").addClass("on");, it works.

But when using $('p:contains('" + valor + "')**'**).addClass("on"), it does not!