[QuickForm] My own validation

Hello, I try to add my own script validation on both client-side and server-side. I Made this regular expression : and add with registerRule. $form->registerRule('is_alpha_cr','regex',"/^[a-zA-Z'éèêëàâäùüûôöîïç, -\n]+$/"); My regular expression looking for a string where there'is only letters, blank and new line (\ n). My problem is that when i'm looking on the source the newline disappear from my expression and there's a real new line. I had an extra backslash. It works with Javascript but not with php because of the extra backslashes. Anybody have a solution to validate a text with regular expression ? Thanks.