http://bugzilla.gnome.org/show_bug.cgi?id=542666

In addition to this patch, you need to create some empty files:

    touch result/schemas/regexp-char-ref_0_0.err
    touch result/schemas/regexp-char-ref_1_0.err


Index: libxml2-svn/xmlregexp.c
===================================================================
--- libxml2-svn/xmlregexp.c	(Revision 3751)
+++ libxml2-svn/xmlregexp.c	(Arbeitskopie)
@@ -4907,64 +4907,6 @@
 }
 
 /**
- * xmlFAParseCharRef:
- * @ctxt:  a regexp parser context
- *
- * [19]   XmlCharRef   ::=   ( '&#' [0-9]+ ';' ) | (' &#x' [0-9a-fA-F]+ ';' )
- */
-static int
-xmlFAParseCharRef(xmlRegParserCtxtPtr ctxt) {
-    int ret = 0, cur;
-
-    if ((CUR != '&') || (NXT(1) != '#'))
-	return(-1);
-    NEXT;
-    NEXT;
-    cur = CUR;
-    if (cur == 'x') {
-	NEXT;
-	cur = CUR;
-	if (((cur >= '0') && (cur <= '9')) ||
-	    ((cur >= 'a') && (cur <= 'f')) ||
-	    ((cur >= 'A') && (cur <= 'F'))) {
-	    while (((cur >= '0') && (cur <= '9')) ||
-	           ((cur >= 'a') && (cur <= 'f')) ||
-		   ((cur >= 'A') && (cur <= 'F'))) {
-		if ((cur >= '0') && (cur <= '9'))
-		    ret = ret * 16 + cur - '0';
-		else if ((cur >= 'a') && (cur <= 'f'))
-		    ret = ret * 16 + 10 + (cur - 'a');
-		else
-		    ret = ret * 16 + 10 + (cur - 'A');
-		NEXT;
-		cur = CUR;
-	    }
-	} else {
-	    ERROR("Char ref: expecting [0-9A-F]");
-	    return(-1);
-	}
-    } else {
-	if ((cur >= '0') && (cur <= '9')) {
-	    while ((cur >= '0') && (cur <= '9')) {
-		ret = ret * 10 + cur - '0';
-		NEXT;
-		cur = CUR;
-	    }
-	} else {
-	    ERROR("Char ref: expecting [0-9]");
-	    return(-1);
-	}
-    }
-    if (cur != ';') {
-	ERROR("Char ref: expecting ';'");
-	return(-1);
-    } else {
-	NEXT;
-    }
-    return(ret);
-}
-
-/**
  * xmlFAParseCharRange:
  * @ctxt:  a regexp parser context
  *
@@ -4985,12 +4927,6 @@
 	return;
     }
 
-    if ((CUR == '&') && (NXT(1) == '#')) {
-	end = start = xmlFAParseCharRef(ctxt);
-        xmlRegAtomAddRange(ctxt, ctxt->atom, ctxt->neg,
-	                   XML_REGEXP_CHARVAL, start, end, NULL);
-	return;
-    }
     cur = CUR;
     if (cur == '\\') {
 	NEXT;
Index: libxml2-svn/result/schemas/regexp-char-ref_0_0.err
===================================================================
Index: libxml2-svn/result/schemas/regexp-char-ref_1_0.err
===================================================================
Index: libxml2-svn/result/schemas/regexp-char-ref_0_0
===================================================================
--- libxml2-svn/result/schemas/regexp-char-ref_0_0	(Revision 0)
+++ libxml2-svn/result/schemas/regexp-char-ref_0_0	(Revision 0)
@@ -0,0 +1 @@
+./test/schemas/regexp-char-ref_0.xml validates
Index: libxml2-svn/result/schemas/regexp-char-ref_1_0
===================================================================
--- libxml2-svn/result/schemas/regexp-char-ref_1_0	(Revision 0)
+++ libxml2-svn/result/schemas/regexp-char-ref_1_0	(Revision 0)
@@ -0,0 +1 @@
+./test/schemas/regexp-char-ref_0.xml validates
Index: libxml2-svn/test/schemas/regexp-char-ref_0.xml
===================================================================
--- libxml2-svn/test/schemas/regexp-char-ref_0.xml	(Revision 0)
+++ libxml2-svn/test/schemas/regexp-char-ref_0.xml	(Revision 0)
@@ -0,0 +1,7 @@
+<?xml version="1.0"?>
+
+<test test1="5"
+      test2="6"
+      test3="#"
+      test4=";"
+      test5="&amp;" />
Index: libxml2-svn/test/schemas/regexp-char-ref_0.xsd
===================================================================
--- libxml2-svn/test/schemas/regexp-char-ref_0.xsd	(Revision 0)
+++ libxml2-svn/test/schemas/regexp-char-ref_0.xsd	(Revision 0)
@@ -0,0 +1,20 @@
+<?xml version="1.0"?>
+<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
+
+    <xs:element name="test">
+        <xs:complexType>
+            <xs:attribute name="test1" type="myType"/>
+            <xs:attribute name="test2" type="myType"/>
+            <xs:attribute name="test3" type="myType"/>
+            <xs:attribute name="test4" type="myType"/>
+            <xs:attribute name="test5" type="myType"/>
+        </xs:complexType>
+    </xs:element>
+
+    <xs:simpleType name="myType">
+        <xs:restriction base="xs:string">
+            <xs:pattern value="[56;&amp;#]"/>
+        </xs:restriction>
+    </xs:simpleType>
+
+</xs:schema>
Index: libxml2-svn/test/schemas/regexp-char-ref_1.xsd
===================================================================
--- libxml2-svn/test/schemas/regexp-char-ref_1.xsd	(Revision 0)
+++ libxml2-svn/test/schemas/regexp-char-ref_1.xsd	(Revision 0)
@@ -0,0 +1,20 @@
+<?xml version="1.0"?>
+<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
+
+    <xs:element name="test">
+        <xs:complexType>
+            <xs:attribute name="test1" type="myType"/>
+            <xs:attribute name="test2" type="myType"/>
+            <xs:attribute name="test3" type="myType"/>
+            <xs:attribute name="test4" type="myType"/>
+            <xs:attribute name="test5" type="myType"/>
+        </xs:complexType>
+    </xs:element>
+
+    <xs:simpleType name="myType">
+        <xs:restriction base="xs:string">
+            <xs:pattern value="[&amp;#65;]"/>
+        </xs:restriction>
+    </xs:simpleType>
+
+</xs:schema>