// ==UserScript==
// @name 　　　Replace Full width bang to half width
// @name:zh-CN  　替换全角！到半角!
// @namespace https://github.com/fengkx/
// @match     https://duckduckgo.com/*
// @match     https://start.duckduckgo.com/*
// @version 0.1
// @description       Replace Full width bang！ to half width!
// @description:en    Replace Full width bang！ to half width!
// @description:zh    替换全角bang！到半角bang!
// @description:zh-CN 替换全角bang！到半角bang!
// @grant none
//@run-at             document-end
// @downloadURL none
// ==/UserScript==

var $input = document.getElementById('search_form_input_homepage') || document.getElementById('search_form_input') ;
$input && $input.addEventListener('input', function (e) {
	this.value = this.value.replace(/^！/, '!');
})