Can Javascript RegExp do partial case insensitivity?

Question

I want to know if Javascript RegExp has the ability to turn on and off case insensitivity within the regular expression itself. I know you can set the modifier for the entir

Answer 1

What you can do is build your regex like this :

var str = "teXT To seArch";
var r = new RegExp(
  str.split('').map(function(c){return '['+c.toLowerCase()+c.toUpperCase()+']'}).join('')
  + ' TOP SECRET'
);