diff --git a/regexp.rkt b/regexp.rkt
index 5eda021..ce41936 100644
--- a/regexp.rkt
+++ b/regexp.rkt
@@ -6,10 +6,10 @@
 ;; TODO groups can be #f when using | ... any other way?
 
 (provide
-  regexp:       define-regexp:
-  pregexp:      define-pregexp:
-  byte-regexp:  define-byte-regexp:
-  byte-pregexp: define-byte-pregexp:
+  regexp:       define-regexp:       let-regexp:
+  pregexp:      define-pregexp:      let-pregexp:
+  byte-regexp:  define-byte-regexp:  let-byte-regexp:
+  byte-pregexp: define-byte-pregexp: let-byte-pregexp:
   ;; Expression and definition forms that try checking their argument patterns.
   ;; If check succeeds, will remember the number of pattern groups
   ;; for calls to `regexp-match:`.
@@ -48,6 +48,7 @@
   (syntax-parser
    [(_ f:id)
     #:with f: (format-id #'f "~a:" (syntax-e #'f))
+    #:with let-f: (format-id #'f "let-~a:" (syntax-e #'f))
     #:with define-f: (format-id #'f "define-~a:" (syntax-e #'f))
     #'(begin
         ;; For expressions, (regexp: val)
@@ -63,6 +64,18 @@
               (cons (syntax-e #'num-groups) #'T))]
            [(_ arg* (... ...))
             #'(f arg* (... ...))]))
+        ;; For lets, (let-regexp: ([id val]) ...)
+        (define-syntax let-f:
+          (syntax-parser
+           [(_ ([name:id pat-stx]) e* (... ...))
+            #:with pat-stx+ (expand-expr #'pat-stx)
+            #:with (num-groups . T) (count-groups #'pat-stx+)
+            (free-id-table-set! id+num-groups
+                                #'name
+                                (cons (syntax-e #'num-groups) #'T))
+            #'(let ([name pat-stx+]) e* (... ...))]
+           [(_ arg* (... ...))
+            #'(let arg* (... ...))]))
         ;; For definitions, (define-regexp: id val)
         (define-syntax define-f:
           (syntax-parser
diff --git a/regexp/no-colon.rkt b/regexp/no-colon.rkt
index b0bdfe5..3523719 100644
--- a/regexp/no-colon.rkt
+++ b/regexp/no-colon.rkt
@@ -8,6 +8,10 @@
   [pregexp: pregexp]
   [byte-regexp: byte-regexp]
   [byte-pregexp: byte-pregexp]
+  [let-regexp: let-regexp]
+  [let-pregexp: let-pregexp]
+  [let-byte-regexp: let-byte-regexp]
+  [let-byte-pregexp: let-byte-pregexp]
   [define-regexp: define-regexp]
   [define-pregexp: define-pregexp]
   [define-byte-regexp: define-byte-regexp]
diff --git a/test/regexp-pass.rkt b/test/regexp-pass.rkt
index 3359fe6..7545077 100644
--- a/test/regexp-pass.rkt
+++ b/test/regexp-pass.rkt
@@ -125,6 +125,14 @@
          (f #"ah(oy"))
        byte-pregexp:)))
 
+  ;; -- let-regexp:
+  (check-equal?
+    (ann
+      (let-regexp: ([rx "\\(\\)he(l*)(o*)"])
+        (regexp-match: rx "helllooo"))
+      (U #f (List String String String)))
+    #f)
+
   ;; -- define-regexp:
   (check-equal?
     (ann
@@ -165,13 +173,21 @@
       (U #f (Listof (U #f String))))
     '("hellooo" "ll" "ooo"))
 
+  ;; -- let-pregexp:
+  (check-equal?
+    (ann
+      (let-pregexp: ([rx #px"he(l*)(o*)"])
+        (regexp-match: rx "helllooo"))
+      (u #f (list string string string)))
+    '("helllooo" "lll" "ooo"))
+
   ;; -- define-pregexp:
   (check-equal?
     (ann
       (let ()
         (define-pregexp: rx #px"he(l*)(o*)")
         (regexp-match: rx "helllooo"))
-      (U #f (List String String String)))
+      (u #f (list string string string)))
     '("helllooo" "lll" "ooo"))
 
   (check-equal?
@@ -189,13 +205,21 @@
       (U #f (List String String String)))
     '("hellooo" "ll" "ooo"))
 
-  ;; -- define-byte-regexp:
   (check-equal?
     (ann
       (regexp-match: #rx#"he(l*)(o*)" #"helllooo")
       (U #f (List Bytes Bytes Bytes)))
     '(#"helllooo" #"lll" #"ooo"))
 
+  ;; -- let-byte-regexp:
+  (check-equal?
+    (ann
+      (let-byte-regexp: ([rx #rx#"he(l*)(o*)"])
+        (regexp-match: rx #"helllooo"))
+      (U #f (List Bytes Bytes Bytes)))
+    '(#"helllooo" #"lll" #"ooo"))
+
+  ;; -- define-byte-regexp:
   (check-equal?
     (ann
       (let ()
@@ -219,13 +243,21 @@
       (U #f (List Bytes Bytes Bytes)))
     '(#"hellooo" #"ll" #"ooo"))
 
-  ;; -- define-byte-pregexp:
   (check-equal?
     (ann
       (regexp-match: #px#"he(l*)(o*)" "helllooo")
       (U #f (List Bytes Bytes Bytes)))
     '(#"helllooo" #"lll" #"ooo"))
 
+  ;; -- let-byte-pregexp:
+  (check-equal?
+    (ann
+      (let-byte-pregexp: ([rx #px#"he(l*)(o*)"])
+        (regexp-match: rx "helllooo"))
+      (U #f (List Bytes Bytes Bytes)))
+    '(#"helllooo" #"lll" #"ooo"))
+
+  ;; -- define-byte-pregexp:
   (check-equal?
     (ann
       (let ()