(?![^a-zA-Z]+$)(?!\D+$)(?![a-zA-Z0-9]+$).{8,}$

使用示例：

function valPasswordFormatNew(){
					var result = true;
					var newPsd = jQuery("#newPsd").val();
					if(newPsd !=""){
						result = (/(?![^a-zA-Z]+$)(?!\D+$)(?![a-zA-Z0-9]+$).{8,}$/.test(newPsd));
					if(newPsd.length<8){
						result = "<@cfw.m code="auth.emsUser.psw.size.error"/>";
					} else if(!result){
						result = "<@cfw.m code="auth.emsUser.psw.vilate"/>";
					}
					}
					if(newPsd != "" && result){
						jQuery("#confirmPassword").attr("data-validation-engine", "validate[required,funcCall[confirmPsd]]");
					}
					return result;
				}

或者:

function valPasswordFormat(){
			var result = true;
			var password = jQuery("#password").val();
			
			//校验数字字母特殊字符同时存在，长度不小于8位
			if(password.length < 8){
				return "密码长度不能小于8位！";
			}
			
			//判断字符串是否为数字和字母
			var regex =  /(?![^a-zA-Z]+$)(?!\D+$)(?![a-zA-Z0-9]+$).{8,}$/;
		    if (!regex.test(password)){
		        return "密码必须由数字、字母和特殊字符组成，且长度不小于8位！";
		    }
			return true;
		}