RegExp.escape = function(str)
{
  var specials = new RegExp("[.*+?|()\\[\\]{}\\\\]", "g"); // .*+?|()[]{}\
  return str.replace(specials, "\\$&");
}

http://stackoverflow.com/questions/280793/case-insensitive-string-replacement-in-javascript

Escape all special regex characters (.*+?|()[]{}\) from a string.  Useful when dynamically building a Regular Expression object based on input text that could hold regex characters.

Escape Regular Expression Characters in String

regex, javascript

JavaScript