diff --git a/regexp.rkt b/regexp.rkt
index f5b4b39..c436496 100644
--- a/regexp.rkt
+++ b/regexp.rkt
@@ -84,6 +84,7 @@
    [(f pat-stx arg* ...)
     #:with pat-stx+ (expand-expr #'pat-stx)
     #:with (num-groups . T) (count-groups #'pat-stx+)
+    #:when (syntax-e #'num-groups)
     #:with (index* ...) #`#,(for/list ([i (in-range (syntax-e #'num-groups))]) i)
     #'(let ([maybe-match (regexp-match pat-stx+ arg* ...)])
         (if maybe-match
@@ -106,15 +107,6 @@
     (format "Valid regexp pattern (contains unmatched ~a)" reason)
     str))
 
-(define-for-syntax (quoted-stx-value? stx)
-  (and
-    (syntax? stx)
-    (let ([v (syntax-e stx)])
-      (and
-        (list? v)
-        (free-identifier=? (car v) (syntax/loc stx quote))
-        (syntax-e (cadr v))))))
-
 (define-for-syntax (count-groups v-stx)
   (cond
     [(syntax-property v-stx num-groups-key)
@@ -163,6 +155,9 @@
                  (eq? #\\ (string-ref str (+ i 1))))
           (loop (+ i 3) in-paren num-groups)
           (loop (+ i 2) in-paren num-groups))]
+       [(#\|)
+        ;; Nope! Can't handle pipes
+        #f]
        [else
         (loop (+ i 1) in-paren num-groups)]))))
 
diff --git a/test/regexp-fail.rkt b/test/regexp-fail.rkt
index e215159..69db9ba 100644
--- a/test/regexp-fail.rkt
+++ b/test/regexp-fail.rkt
@@ -43,6 +43,11 @@
         (define rx "he(l*)(o*)")
         (regexp-match: rx "helloooooooo"))
       (U #f (List String String String))))
+  ;; --- Can't handle |, yet
+  (module t typed/racket/base (require trivial/regexp)
+    (ann
+      (regexp-match: "this(group)|that" "that")
+      (U #f (List String String))))
 )))
 
 (module+ test
diff --git a/test/regexp-pass.rkt b/test/regexp-pass.rkt
index e3619ab..1783634 100644
--- a/test/regexp-pass.rkt
+++ b/test/regexp-pass.rkt
@@ -247,4 +247,13 @@
       (U #f (List Bytes Bytes Bytes)))
     '(#"hellooo" #"ll" #"ooo"))
 
+  ;; -- special cases / miscellaneous
+
+  ;; --- Can't handle |, yet
+  (check-equal?
+    (ann
+      (regexp-match: "this(group)|that" "that")
+      (U #f (Listof (U #f String))))
+    '("that" #f))
+
 )