Index: src/test_regexp.c
==================================================================
--- src/test_regexp.c
+++ src/test_regexp.c
@@ -24,11 +24,11 @@
 **     X$      X occurring at the end of the string
 **     .       Match any single character
 **     \c      Character c where c is one of \{}()[]|*+?.
 **     \c      C-language escapes for c in afnrtv.  ex: \t or \n
 **     \uXXXX  Where XXXX is exactly 4 hex digits, unicode value XXXX
-**     \xXXX   Where XXX is any number of hex digits, unicode value XXX
+**     \xXX    Where XX is exactly 2 hex digits, unicode value XX
 **     [abc]   Any single character from the set abc
 **     [^abc]  Any single character not in the set abc
 **     [a-z]   Any single character in the range a-z
 **     [^a-z]  Any single character not in the range a-z
 **     \b      Word boundary
@@ -385,27 +385,27 @@
   static const char zTrans[] = "\a\f\n\r\t\v";
   int i, v = 0;
   char c;
   if( p->sIn.i>=p->sIn.mx ) return 0;
   c = p->sIn.z[p->sIn.i];
-  if( c=='u' && p->sIn.i+5<p->sIn.mx ){
+  if( c=='u' && p->sIn.i+4<p->sIn.mx ){
     const unsigned char *zIn = p->sIn.z + p->sIn.i;
-    v = 0;
     if( re_hex(zIn[1],&v)
      && re_hex(zIn[2],&v)
      && re_hex(zIn[3],&v)
      && re_hex(zIn[4],&v)
     ){
       p->sIn.i += 5;
       return v;
     }
   }
-  if( c=='x' ){
-    v = 0;
-    for(i=1; p->sIn.i<p->sIn.mx && re_hex(p->sIn.z[p->sIn.i+i], &v); i++){}
-    if( i>1 ){
-      p->sIn.i += i;
+  if( c=='x' && p->sIn.i+2<p->sIn.mx ){
+    const unsigned char *zIn = p->sIn.z + p->sIn.i;
+    if( re_hex(zIn[1],&v)
+     && re_hex(zIn[2],&v)
+    ){
+      p->sIn.i += 3;
       return v;
     }
   }
   for(i=0; zEsc[i] && zEsc[i]!=c; i++){}
   if( zEsc[i] ){

Index: test/regexp1.test
==================================================================
--- test/regexp1.test
+++ test/regexp1.test
@@ -195,16 +195,16 @@
 } {1 1 1 1 1 1 1 1 1 1 1 1}
 
 do_execsql_test regexp1-2.20 {
   SELECT 'abc$¢€xyz' REGEXP '^abc\u0024\u00a2\u20acxyz$',
          'abc$¢€xyz' REGEXP '^abc\u0024\u00A2\u20ACxyz$',
-         'abc$¢€xyz' REGEXP '^abc\x24\xa2\x20acxyz$'
+         'abc$¢€xyz' REGEXP '^abc\x24\xa2\u20acxyz$'
 } {1 1 1}
 do_execsql_test regexp1-2.21 {
   SELECT 'abc$¢€xyz' REGEXP '^abc[\u0024][\u00a2][\u20ac]xyz$',
          'abc$¢€xyz' REGEXP '^abc[\u0024\u00A2\u20AC]{3}xyz$',
-         'abc$¢€xyz' REGEXP '^abc[\x24][\xa2\x20ac]+xyz$'
+         'abc$¢€xyz' REGEXP '^abc[\x24][\xa2\u20ac]+xyz$'
 } {1 1 1}
 do_execsql_test regexp1-2.22 {
   SELECT 'abc$¢€xyz' REGEXP '^abc[^\u0025-X][^ -\u007f][^\u20ab]xyz$'
 } {1}