JS验证表单中TEXT文本框中是否含有非法字符

　　　　　<form id="form" action="" method="post">
                <input type="hidden" name="selected" value="" />
                <table class="conditionTable">
                    <tr>
                        <td class="first">用户姓名：</td>
                        <td width="20%">
                            <div class="condition-text-container">
                                <input name="user_name" type="text" class="condition-text" maxlength="40"/>
                            </div>
                        </td>
                        <td class="first">用户帐号：</td>
                        <td width="20%">
                            <div class="condition-text-container">
                                <input name="user_code" type="text" class="condition-text" maxlength="40"/>
                            </div>
                        </td>
                    </tr>
                    <tr>
                          <td><div class="btn-operation" onClick="searchData()">查询</div>
                          <div class="btn-reset" onClick="resetting()">重置</div></td>
                    </tr>
                </table>
       </form>
       <script type="text/javascript">function searchData() {
        var inputContext = ($("#form").find("input[type=text]"));
        var pattern = /[~!@#$%^&*()_+-=]$/;
        var flag = false;
        $.each(inputContext, function(index, text){
            if(pattern.test(text.value)){
                $.messager.alert("提示", "搜索条件中含有非法字符，请重新输入!","info");
                flag = true;;
            }
        });
        if(flag){
            alert(1);
            return;
        }
  </script>