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diff -ur a/irregex-core.scm b/irregex-core.scm
--- a/irregex-core.scm 2016-09-11 19:03:00.000000000 -0400
+++ b/irregex-core.scm 2017-01-01 22:24:08.000000000 -0500
@@ -30,6 +30,8 @@
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;; History
+;; 0.9.6: 2016/12/05 - fixed exponential memory use of + in compilation
+;; of backtracking matcher.
;; 0.9.5: 2016/09/10 - fixed a bug in irregex-fold handling of bow
;; 0.9.4: 2015/12/14 - performance improvement for {n,m} matches
;; 0.9.3: 2014/07/01 - R7RS library
@@ -3170,16 +3172,7 @@
((sre-empty? (sre-sequence (cdr sre)))
(error "invalid sre: empty *" sre))
(else
- (letrec
- ((body
- (lp (sre-sequence (cdr sre))
- n
- flags
- (lambda (cnk init src str i end matches fail)
- (body cnk init src str i end matches
- (lambda ()
- (next cnk init src str i end matches fail)
- ))))))
+ (let ((body (rec (list '+ (sre-sequence (cdr sre))))))
(lambda (cnk init src str i end matches fail)
(body cnk init src str i end matches
(lambda ()
@@ -3204,10 +3197,21 @@
(lambda ()
(body cnk init src str i end matches fail))))))))
((+)
- (lp (sre-sequence (cdr sre))
- n
- flags
- (rec (list '* (sre-sequence (cdr sre))))))
+ (cond
+ ((sre-empty? (sre-sequence (cdr sre)))
+ (error "invalid sre: empty +" sre))
+ (else
+ (letrec
+ ((body
+ (lp (sre-sequence (cdr sre))
+ n
+ flags
+ (lambda (cnk init src str i end matches fail)
+ (body cnk init src str i end matches
+ (lambda ()
+ (next cnk init src str i end matches fail)
+ ))))))
+ body))))
((=)
(rec `(** ,(cadr sre) ,(cadr sre) ,@(cddr sre))))
((>=)
diff -ur a/irregex-utils.scm b/irregex-utils.scm
--- a/irregex-utils.scm 2016-09-11 19:03:00.000000000 -0400
+++ b/irregex-utils.scm 2017-01-01 22:25:25.000000000 -0500
@@ -89,7 +89,7 @@
(case (car x)
((: seq)
(cond
- ((and (pair? (cddr x)) (pair? (cddr x)) (not (eq? x obj)))
+ ((and (pair? (cdr x)) (pair? (cddr x)) (not (eq? x obj)))
(display "(?:" out) (for-each lp (cdr x)) (display ")" out))
(else (for-each lp (cdr x)))))
((submatch)
diff -ur "a/manual-html/Unit irregex.html" "b/manual-html/Unit irregex.html"
--- "a/manual-html/Unit irregex.html" 2016-09-11 19:10:47.000000000 -0400
+++ "b/manual-html/Unit irregex.html" 2017-01-01 22:26:05.000000000 -0500
@@ -353,6 +353,6 @@
<dd class="defsig"><p>Returns an optimized SRE matching any of the literal strings in the list, like Emacs' <tt>regexp-opt</tt>. Note this optimization doesn't help when irregex is able to build a DFA.</p></dd>
</dl>
<h5 id="sec:sre-.3estring"><a href="#sec:sre-.3estring">sre->string</a></h5><dl class="defsig"><dt class="defsig" id="def:sre-.3estring"><span class="sig"><tt>(sre->string <sre>)</tt></span> <span class="type">procedure</span></dt>
-<dd class="defsig"><p>Convert an SRE to a POSIX-style regular expression string, if possible.</p></dd>
+<dd class="defsig"><p>Convert an SRE to a PCRE-style regular expression string, if possible.</p></dd>
</dl>
-<hr /><p>Previous: <a href="Unit%20extras.html">Unit extras</a></p><p>Next: <a href="Unit%20srfi-1.html">Unit srfi-1</a></p></div></div></body>
\ No newline at end of file
+<hr /><p>Previous: <a href="Unit%20extras.html">Unit extras</a></p><p>Next: <a href="Unit%20srfi-1.html">Unit srfi-1</a></p></div></div></body>
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