diff --git a/scsh/re.scm b/scsh/re.scm
index 7a35080..004e1ad 100644
--- a/scsh/re.scm
+++ b/scsh/re.scm
@@ -148,6 +148,64 @@
 		  0 items)
 	  ans))))
 
+
+
+(define (regexp-substitute/global port str re . items)
+  (let ((range (lambda (start item)		; Return start & end of
+		 (cond ((integer? item)		; ITEM's range in STR.
+			(values (vector-ref sv item)
+				(vector-ref ev item)))
+		       ((eq? 'pre item) (values start (vector-ref sv 0)))
+		       (else (error "Illegal substitution item."
+				    item
+				    regexp-substitute)))))
+	(num-posts (reduce (lambda (count item)
+			     (+ count (if (eq? item 'post) 1 0)))
+			   0 items)))
+  (if (and port (< num-posts 2))
+
+      ;; Output port case, with zero or one POST items.
+      (let recur ((start 0))
+	(let ((match (string-match re str start)))
+	  (and match
+	       (let* ((sv (regexp-match:start match))
+		      (ev (regexp-match:end match)))
+		 (for-each (lambda (item)
+			     (cond ((string? item) (write-string item port))
+				   ((eq? 'post item)
+				    (let ((post-start (vector-ref ev 0)))
+				      (or (recur post-start)
+					  (write-string item port post-start))))
+				   (else (receive (si ei) (range start item)
+					   (write-string str port si ei)))))
+			   items)
+		 #t))))
+
+      (let ((pieces (let recur ((start 0))
+		      (let ((match (string-match re str start))
+			    (cached-post #f))
+			(and match
+			     (let* ((sv (regexp-match:start match))
+				    (ev (regexp-match:end match)))
+			       (reduce (lambda (pieces item)
+					 (cond ((string? item) (cons item pieces))
+					       ((eq? 'post item)
+						(append (or cached-post
+							    (begin (set! cached-post
+									 (recur (vector-ref ev 0)))
+								   cached-post))
+							pieces))
+					       (else (receive (si ei) (range start item)
+						       (cons (substring str si e1)
+							     pieces)))))
+				       0 items)))))))
+	(and pieces
+	     (let ((pieces (reverse pieces)))
+	       (if port (for-each (lambda (p) (write-string p port)) pieces)
+		   (apply string-append pieces))))))))
+
+
+
 ;;; Miscellaneous
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 
diff --git a/scsh/scsh-interfaces.scm b/scsh/scsh-interfaces.scm
index 513ceef..de4fb77 100644
--- a/scsh/scsh-interfaces.scm
+++ b/scsh/scsh-interfaces.scm
@@ -427,6 +427,7 @@
 	  regexp?
 	  regexp-exec
 	  regexp-substitute
+	  regexp-substitute/global
 	  regexp-quote))