diff --git a/t/t4034/cpp/expect b/t/t4034/cpp/expect
index 5ff4ce477b..dc500ae092 100644
--- a/t/t4034/cpp/expect
+++ b/t/t4034/cpp/expect
@@ -1,21 +1,21 @@
 <BOLD>diff --git a/pre b/post<RESET>
-<BOLD>index 144cd98..64e78af 100644<RESET>
+<BOLD>index a1a09b7..f1b6f3c 100644<RESET>
 <BOLD>--- a/pre<RESET>
 <BOLD>+++ b/post<RESET>
 <CYAN>@@ -1,30 +1,30 @@<RESET>
 Foo() : x(0<RED>&&1<RESET><GREEN>&42<RESET>) { <RED>foo0<RESET><GREEN>bar<RESET>(x.<RED>find<RESET><GREEN>Find<RESET>); }
 cout<<"Hello World<RED>!<RESET><GREEN>?<RESET>\n"<<endl;
-<GREEN>(<RESET>1 <RED>-<RESET><GREEN>+<RESET>1e10 0xabcdef<GREEN>)<RESET> '<RED>x<RESET><GREEN>.<RESET>'
+<GREEN>(<RESET>1 <RED>-<RESET><GREEN>+<RESET>1e10 0xabcdef<GREEN>)<RESET> '<RED>x<RESET><GREEN>2<RESET>'
 // long double<RESET>
-<RED>3.141'592'653e-10l<RESET><GREEN>3.141'592'654e+10l<RESET>
+<RED>3.141592653e-10l<RESET><GREEN>3.141592654e+10l<RESET>
 // float<RESET>
 <RED>120E5f<RESET><GREEN>120E6f<RESET>
 // hex<RESET>
-<RED>0xdead'beaf<RESET><GREEN>0xdead'Beaf<RESET>+<RED>8ULL<RESET><GREEN>7ULL<RESET>
+<RED>0xdead<RESET><GREEN>0xdeaf<RESET>'1<RED>eaF<RESET><GREEN>eaf<RESET>+<RED>8ULL<RESET><GREEN>7ULL<RESET>
 // octal<RESET>
-<RED>0123'4567<RESET><GREEN>0123'4560<RESET>
+<RED>01234567<RESET><GREEN>01234560<RESET>
 // binary<RESET>
-<RED>0b10'00<RESET><GREEN>0b11'00<RESET>+e1
+<RED>0b1000<RESET><GREEN>0b1100<RESET>+e1
 // expression<RESET>
 1.5-e+<RED>2<RESET><GREEN>3<RESET>+f
 // another one<RESET>
diff --git a/t/t4034/cpp/post b/t/t4034/cpp/post
index 64e78afbfb..f1b6f3c228 100644
--- a/t/t4034/cpp/post
+++ b/t/t4034/cpp/post
@@ -1,16 +1,16 @@
 Foo() : x(0&42) { bar(x.Find); }
 cout<<"Hello World?\n"<<endl;
-(1 +1e10 0xabcdef) '.'
+(1 +1e10 0xabcdef) '2'
 // long double
-3.141'592'654e+10l
+3.141592654e+10l
 // float
 120E6f
 // hex
-0xdead'Beaf+7ULL
+0xdeaf'1eaf+7ULL
 // octal
-0123'4560
+01234560
 // binary
-0b11'00+e1
+0b1100+e1
 // expression
 1.5-e+3+f
 // another one
diff --git a/t/t4034/cpp/pre b/t/t4034/cpp/pre
index 144cd980d6..a1a09b7712 100644
--- a/t/t4034/cpp/pre
+++ b/t/t4034/cpp/pre
@@ -2,15 +2,15 @@ Foo():x(0&&1){ foo0( x.find); }
 cout<<"Hello World!\n"<<endl;
 1 -1e10 0xabcdef 'x'
 // long double
-3.141'592'653e-10l
+3.141592653e-10l
 // float
 120E5f
 // hex
-0xdead'beaf+8ULL
+0xdead'1eaF+8ULL
 // octal
-0123'4567
+01234567
 // binary
-0b10'00+e1
+0b1000+e1
 // expression
 1.5-e+2+f
 // another one
diff --git a/userdiff.c b/userdiff.c
index 7b143ef36b..8578cb0d12 100644
--- a/userdiff.c
+++ b/userdiff.c
@@ -67,11 +67,11 @@ PATTERNS("cpp",
 	 /* identifiers and keywords */
 	 "[a-zA-Z_][a-zA-Z0-9_]*"
 	 /* decimal and octal integers as well as floatingpoint numbers */
-	 "|[0-9][0-9.']*([Ee][-+]?[0-9]+)?[fFlLuU]*"
+	 "|[0-9][0-9.]*([Ee][-+]?[0-9]+)?[fFlLuU]*"
 	 /* hexadecimal and binary integers */
-	 "|0[xXbB][0-9a-fA-F']+[lLuU]*"
+	 "|0[xXbB][0-9a-fA-F]+[lLuU]*"
 	 /* floatingpoint numbers that begin with a decimal point */
-	 "|\\.[0-9][0-9']*([Ee][-+]?[0-9]+)?[fFlL]?"
+	 "|\\.[0-9][0-9]*([Ee][-+]?[0-9]+)?[fFlL]?"
 	 "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->\\*?|\\.\\*|<=>"),
 PATTERNS("csharp",
 	 /* Keywords */