2 files changed, 8 insertions, 3 deletions
diff --git a/regcomp.c b/regcomp.c
index ff9f87b079..bcdc65f2d8 100644
--- a/regcomp.c
+++ b/regcomp.c
@@ -7601,7 +7601,7 @@ tryagain:
 		    case '0': case '1': case '2': case '3':case '4':
 		    case '5': case '6': case '7': case '8':case '9':
 			if (*p == '0' ||
-			    (isOCTAL(p[1]) && atoi(p) >= RExC_npar))
+			    (isDIGIT(p[1]) && atoi(p) >= RExC_npar))
 			{
 			    I32 flags = PERL_SCAN_SILENT_ILLDIGIT;
 			    STRLEN numlen = 3;
diff --git a/t/re/re.t b/t/re/re.t
index 76835f09b3..ecbcb29440 100644
--- a/t/re/re.t
+++ b/t/re/re.t
@@ -53,13 +53,18 @@ if ('1234'=~/(?:(?<A>\d)|(?<C>!))(?<B>\d)(?<A>\d)(?<B>\d)/){
     is(regnames_count(),3);
 }
 
-    { # Keep this test last, as whole script will be interrupted if times out
+    { # Keep these tests last, as whole script will be interrupted if times out
         # Bug #72998; this can loop 
         watchdog(2);
         eval '"\x{100}\x{FB00}" =~ /\x{100}\N{U+66}+/i';
         pass("Didn't loop");
+
+        # Bug #78058; this can loop
+        watchdog(2);
+        eval 'qr/\18/';
+        pass("qr/\18/ didn't loop");
     }
 
 # New tests above this line, don't forget to update the test count below!
-BEGIN { plan tests => 19 }
+BEGIN { plan tests => 20 }
 # No tests here!