javascript - RegExp range out of order with complex pattern -

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this pattern:

var pattern = "/(?:https?:\/\/)?(?:www\.)?facebook\.com\/(?:(?:\w)*#!\/)?(?:pages\/)?(?:[\w\-]*\/)*([\w\-\.]*)/"; var matches = $("#search input").val().match(new regexp(pattern));

when use it, gives me error:

uncaught syntaxerror: invalid regular expression: //(?:https?://)?(?:www.)?facebook.com/(?:(?:w)*#!/)?(?:pages/)?(?:[w-]*/)*([w-.]*)//: range out of order in character class

from reading on similar issues came attention need double escape characters, don't know out of pattern.

remove unwanted double quotes regex pattern:

 var pattern = /(?:https?:\/\/)?(?:www\.)?facebook\.com\/(?:(?:\w)*#!\/)?(?:pages\/)?(?:[\w\-]*\/)*([\w\-\.]*)/;

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