!80 bug-fix(用户管理)

Merge pull request !80 from fengdan/fengdan-feature-usermanage：add-fix

yudao-module-system/yudao-module-system-impl/src/main/java/cn/iocoder/yudao/module/system/controller/admin/user/vo/user/UserBaseVO.java

@@ -6,6 +6,7 @@ import org.hibernate.validator.constraints.Length;
 
 import javax.validation.constraints.Email;
 import javax.validation.constraints.NotBlank;
+import javax.validation.constraints.Pattern;
 import javax.validation.constraints.Size;
 import java.util.Set;
 
@@ -18,6 +19,7 @@ public class UserBaseVO {
 
     @ApiModelProperty(value = "用户账号", required = true, example = "yudao")
     @NotBlank(message = "用户账号不能为空")
+    @Pattern(regexp = "^[a-zA-Z0-9]{4,30}$", message = "用户账号由 数字、字母 组成")
     @Size(min = 4, max = 30, message = "用户账号长度为 4-30 个字符")
     private String username;