diff --git a/libcxx/test/std/re/re.regex/re.regex.construct/bad_escape.pass.cpp b/libcxx/test/std/re/re.regex/re.regex.construct/bad_escape.pass.cpp
--- a/libcxx/test/std/re/re.regex/re.regex.construct/bad_escape.pass.cpp
+++ b/libcxx/test/std/re/re.regex/re.regex.construct/bad_escape.pass.cpp
@@ -32,15 +32,11 @@
 int main(int, char**)
 {
     assert(error_escape_thrown("[\\a]"));
-    assert(error_escape_thrown("\\a"));
     assert(error_escape_thrown("\\"));
 
     assert(error_escape_thrown("[\\e]"));
-    assert(error_escape_thrown("\\e"));
 
     assert(error_escape_thrown("[\\c:]"));
-    assert(error_escape_thrown("\\c:"));
-    assert(error_escape_thrown("\\c"));
     assert(!error_escape_thrown("[\\cA]"));
     assert(!error_escape_thrown("\\cA"));