字典类型必须以字母开头，且只能为（小写字母，数字，下滑线）

ruoyi-api/ruoyi-api-system/src/main/java/com/ruoyi/system/api/domain/SysDictType.java

 package com.ruoyi.system.api.domain;
 
 import javax.validation.constraints.NotBlank;
+import javax.validation.constraints.Pattern;
 import javax.validation.constraints.Size;
 import org.apache.commons.lang3.builder.ToStringBuilder;
 import org.apache.commons.lang3.builder.ToStringStyle;
@@ -57,6 +58,7 @@ public class SysDictType extends BaseEntity
 
     @NotBlank(message = "字典类型不能为空")
     @Size(min = 0, max = 100, message = "字典类型类型长度不能超过100个字符")
+    @Pattern(regexp = "^[a-z][a-z0-9_]*$", message = "字典类型必须以字母开头，且只能为（小写字母，数字，下滑线）")
     public String getDictType()
     {
         return dictType;