export function getParameterByName ( name ) { name = name . replace ( /[\[\]]/g , '\\$&' ) ; const regex = new RegExp ( '[?&]' + name + '(=([^&#]*)|&|#|$)' ) ; const results = regex . exec ( window . location . href ) ; if ( ! results ) { return null ; } if ( ! results [ 2 ] ) { return '' ; } return decodeURIComponent ( results [ 2 ] . replace ( /\+/g , ' ' ) ) ; }