diff --git a/common/lang/lang.xml b/common/lang/lang.xml
index 94950f131..e0f26b50d 100644
--- a/common/lang/lang.xml
+++ b/common/lang/lang.xml
@@ -3734,6 +3734,10 @@ Bitte melden Sie sich dem Administrator des Moduls!]]></value>
 			<value xml:lang="vi"><![CDATA[Định dạng của %s không hợp lệ. Chỉ sử dụng các kí tự từ a-z và các chữ số]]></value>
 			<value xml:lang="mn"><![CDATA[%s-ын хэлбэр буруу байна. Зөвхөн латин үсэг болон тоогоор л оруулах ёстой.]]></value>
 		</item>
+		<item name="invalid_mid">
+			<value xml:lang="ko"><![CDATA[%s의 형식이 잘못되었습니다. 첫 글자는 영문으로 시작해야 하며 '영문+숫자+_'로만 입력하셔야 합니다.]]></value>
+			<value xml:lang="en"><![CDATA[The format of %s is invalid. Module ID should be begun with a letter. Subsequent characters may be letters, digits or underscore characters.]]></value>
+		</item>
 		<item name="invalid_number">
 			<value xml:lang="ko"><![CDATA[%s의 형식이 잘못되었습니다. 숫자로만 입력하셔야 합니다.]]></value>
 			<value xml:lang="en"><![CDATA[The format of %s is invalid. Please enter numbers only.]]></value>
diff --git a/modules/page/ruleset/insertPage.xml b/modules/page/ruleset/insertPage.xml
index 254c03298..fbdaf7125 100644
--- a/modules/page/ruleset/insertPage.xml
+++ b/modules/page/ruleset/insertPage.xml
@@ -1,10 +1,11 @@
 <?xml version="1.0" encoding="utf-8"?>
 <ruleset version="1.5.0">
     <customrules>
+		<rule name="mid" type="regex" test="/^[a-zA-Z]+[0-9a-zA-Z_]*$/"  />
     </customrules>
     <fields>
 		<field name="page_type" required="true" rule="alpha" />
-		<field name="page_name" required="true" length=":40" rule="alpha_number" />
+		<field name="page_name" required="true" length=":40" rule="mid" />
 		<field name="browser_title" required="true" length=":250" />
 		<field name="path">
 			<if test="$page_type == 'OUTSIDE'" attr="required" value="true" />
diff --git a/modules/page/ruleset/updatePage.xml b/modules/page/ruleset/updatePage.xml
index 5240d0f4f..0d62d8782 100644
--- a/modules/page/ruleset/updatePage.xml
+++ b/modules/page/ruleset/updatePage.xml
@@ -1,9 +1,10 @@
 <?xml version="1.0" encoding="utf-8"?>
 <ruleset version="1.5.0">
     <customrules>
+		<rule name="mid" type="regex" test="/^[a-zA-Z]+[0-9a-zA-Z_]*$/"  />
     </customrules>
     <fields>
-		<field name="page_name" required="true" length=":40" rule="alpha_number" />
+		<field name="page_name" required="true" length=":40" rule="mid" />
 		<field name="browser_title" required="true" length=":250" />
 		<field name="path">
 			<if test="$page_type == 'OUTSIDE'" attr="required" value="true" />