diff --git a/t/t4034/ada/expect b/t/t4034/ada/expect
index be2376e..a682d28 100644
--- a/t/t4034/ada/expect
+++ b/t/t4034/ada/expect
@@ -4,7 +4,7 @@
 <BOLD>+++ b/post<RESET>
 <CYAN>@@ -1,13 +1,13 @@<RESET>
 Ada.Text_IO.Put_Line("Hello World<RED>!<RESET><GREEN>?<RESET>");
-1 1e<RED>-<RESET>10 16#FE12#E2 3.141_592 '<RED>x<RESET><GREEN>y<RESET>'
+1 <RED>1e-10<RESET><GREEN>1e10<RESET> 16#FE12#E2 3.141_592 '<RED>x<RESET><GREEN>y<RESET>'
 <RED>a<RESET><GREEN>x<RESET>+<RED>b a<RESET><GREEN>y x<RESET>-<RED>b<RESET>
 <RED>a<RESET><GREEN>y<RESET>
 <GREEN>x<RESET>*<RED>b a<RESET><GREEN>y x<RESET>/<RED>b<RESET>
diff --git a/userdiff.c b/userdiff.c
index ea43a03..10b61ec 100644
--- a/userdiff.c
+++ b/userdiff.c
@@ -15,13 +15,13 @@
 	  word_regex "|[^[:space:]]|[\xc0-\xff][\x80-\xbf]+" }
 static struct userdiff_driver builtin_drivers[] = {
 IPATTERN("ada",
-	 "!^(.*[ \t])?(is new|renames|is separate)([ \t].*)?$\n"
+	 "!^(.*[ \t])?(is[ \t]+new|renames|is[ \t]+separate)([ \t].*)?$\n"
 	 "!^[ \t]*with[ \t].*$\n"
 	 "^[ \t]*((procedure|function)[ \t]+.*)$\n"
 	 "^[ \t]*((package|protected|task)[ \t]+.*)$",
 	 /* -- */
 	 "[a-zA-Z][a-zA-Z0-9_]*"
-	 "|[0-9][-+0-9#_.eE]"
+	 "|[-+]?[0-9][0-9#_.aAbBcCdDeEfF]*([eE][+-]?[0-9_]+)?"
 	 "|=>|\\.\\.|\\*\\*|:=|/=|>=|<=|<<|>>|<>"),
 IPATTERN("fortran",
 	 "!^([C*]|[ \t]*!)\n"