diff --git a/include/common/mini-clist.h b/include/common/mini-clist.h
index fa0537c..e89ffe0 100644
--- a/include/common/mini-clist.h
+++ b/include/common/mini-clist.h
@@ -39,6 +39,13 @@
 	char *s;
 };
 
+/* this is the same as above with an additional pointer to a condition. */
+struct cond_wordlist {
+	struct list list;
+	void *cond;
+	char *s;
+};
+
 /* First undefine some macros which happen to also be defined on OpenBSD,
  * in sys/queue.h, used by sys/event.h
  */
diff --git a/include/common/regex.h b/include/common/regex.h
index bc86bbd..60c7f42 100644
--- a/include/common/regex.h
+++ b/include/common/regex.h
@@ -1,23 +1,23 @@
 /*
-  include/common/regex.h
-  This file defines everything related to regular expressions.
-
-  Copyright (C) 2000-2006 Willy Tarreau - w@1wt.eu
-  
-  This library is free software; you can redistribute it and/or
-  modify it under the terms of the GNU Lesser General Public
-  License as published by the Free Software Foundation, version 2.1
-  exclusively.
-
-  This library is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-  Lesser General Public License for more details.
-
-  You should have received a copy of the GNU Lesser General Public
-  License along with this library; if not, write to the Free Software
-  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
-*/
+ * include/common/regex.h
+ * This file defines everything related to regular expressions.
+ *
+ * Copyright (C) 2000-2010 Willy Tarreau - w@1wt.eu
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation, version 2.1
+ * exclusively.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
 
 #ifndef _COMMON_REGEX_H
 #define _COMMON_REGEX_H
@@ -45,6 +45,7 @@
     const regex_t *preg;		/* expression to look for */
     int action;				/* ACT_ALLOW, ACT_REPLACE, ACT_REMOVE, ACT_DENY */
     const char *replace;		/* expression to set instead */
+    void *cond;				/* a possible condition or NULL */
 };
 
 extern regmatch_t pmatch[MAX_MATCH];
@@ -52,7 +53,7 @@
 int exp_replace(char *dst, char *src, const char *str,	const regmatch_t *matches);
 const char *check_replace_string(const char *str);
 const char *chain_regex(struct hdr_exp **head, const regex_t *preg,
-			int action, const char *replace);
+			int action, const char *replace, void *cond);
 
 #endif /* _COMMON_REGEX_H */
 
diff --git a/src/cfgparse.c b/src/cfgparse.c
index ab82871..bf2ad2a 100644
--- a/src/cfgparse.c
+++ b/src/cfgparse.c
@@ -3564,7 +3564,7 @@
 			goto out;
 		}
 	
-		err = chain_regex(&curproxy->req_exp, preg, ACT_REPLACE, strdup(args[2]));
+		err = chain_regex(&curproxy->req_exp, preg, ACT_REPLACE, strdup(args[2]), NULL);
 		if (err) {
 			Alert("parsing [%s:%d] : invalid character or unterminated sequence in replacement string near '%c'.\n",
 			      file, linenum, *err);
@@ -3595,7 +3595,7 @@
 			goto out;
 		}
 	
-		chain_regex(&curproxy->req_exp, preg, ACT_REMOVE, NULL);
+		chain_regex(&curproxy->req_exp, preg, ACT_REMOVE, NULL, NULL);
 		warnif_misplaced_reqxxx(curproxy, file, linenum, args[0]);
 	}
 	else if (!strcmp(args[0], "reqdeny")) {  /* deny a request if a header matches this regex */
@@ -3621,7 +3621,7 @@
 			goto out;
 		}
 	
-		chain_regex(&curproxy->req_exp, preg, ACT_DENY, NULL);
+		chain_regex(&curproxy->req_exp, preg, ACT_DENY, NULL, NULL);
 		warnif_misplaced_reqxxx(curproxy, file, linenum, args[0]);
 	}
 	else if (!strcmp(args[0], "reqpass")) {  /* pass this header without allowing or denying the request */
@@ -3647,7 +3647,7 @@
 			goto out;
 		}
 	
-		chain_regex(&curproxy->req_exp, preg, ACT_PASS, NULL);
+		chain_regex(&curproxy->req_exp, preg, ACT_PASS, NULL, NULL);
 		warnif_misplaced_reqxxx(curproxy, file, linenum, args[0]);
 	}
 	else if (!strcmp(args[0], "reqallow")) {  /* allow a request if a header matches this regex */
@@ -3673,7 +3673,7 @@
 			goto out;
 		}
 	
-		chain_regex(&curproxy->req_exp, preg, ACT_ALLOW, NULL);
+		chain_regex(&curproxy->req_exp, preg, ACT_ALLOW, NULL, NULL);
 		warnif_misplaced_reqxxx(curproxy, file, linenum, args[0]);
 	}
 	else if (!strcmp(args[0], "reqtarpit")) {  /* tarpit a request if a header matches this regex */
@@ -3699,7 +3699,7 @@
 			goto out;
 		}
 	
-		chain_regex(&curproxy->req_exp, preg, ACT_TARPIT, NULL);
+		chain_regex(&curproxy->req_exp, preg, ACT_TARPIT, NULL, NULL);
 		warnif_misplaced_reqxxx(curproxy, file, linenum, args[0]);
 	}
 	else if (!strcmp(args[0], "reqsetbe")) { /* switch the backend from a regex, respecting case */
@@ -3726,7 +3726,7 @@
 			goto out;
 		}
 
-		chain_regex(&curproxy->req_exp, preg, ACT_SETBE, strdup(args[2]));
+		chain_regex(&curproxy->req_exp, preg, ACT_SETBE, strdup(args[2]), NULL);
 		warnif_misplaced_reqxxx(curproxy, file, linenum, args[0]);
 	}
 	else if (!strcmp(args[0], "reqisetbe")) { /* switch the backend from a regex, ignoring case */
@@ -3753,7 +3753,7 @@
 			goto out;
 		}
 
-		chain_regex(&curproxy->req_exp, preg, ACT_SETBE, strdup(args[2]));
+		chain_regex(&curproxy->req_exp, preg, ACT_SETBE, strdup(args[2]), NULL);
 		warnif_misplaced_reqxxx(curproxy, file, linenum, args[0]);
 	}
 	else if (!strcmp(args[0], "reqirep")) {  /* replace request header from a regex, ignoring case */
@@ -3780,7 +3780,7 @@
 			goto out;
 		}
 	
-		err = chain_regex(&curproxy->req_exp, preg, ACT_REPLACE, strdup(args[2]));
+		err = chain_regex(&curproxy->req_exp, preg, ACT_REPLACE, strdup(args[2]), NULL);
 		if (err) {
 			Alert("parsing [%s:%d] : invalid character or unterminated sequence in replacement string near '%c'.\n",
 			      file, linenum, *err);
@@ -3812,7 +3812,7 @@
 			goto out;
 		}
 	
-		chain_regex(&curproxy->req_exp, preg, ACT_REMOVE, NULL);
+		chain_regex(&curproxy->req_exp, preg, ACT_REMOVE, NULL, NULL);
 		warnif_misplaced_reqxxx(curproxy, file, linenum, args[0]);
 	}
 	else if (!strcmp(args[0], "reqideny")) {  /* deny a request if a header matches this regex ignoring case */
@@ -3838,7 +3838,7 @@
 			goto out;
 		}
 	
-		chain_regex(&curproxy->req_exp, preg, ACT_DENY, NULL);
+		chain_regex(&curproxy->req_exp, preg, ACT_DENY, NULL, NULL);
 		warnif_misplaced_reqxxx(curproxy, file, linenum, args[0]);
 	}
 	else if (!strcmp(args[0], "reqipass")) {  /* pass this header without allowing or denying the request */
@@ -3864,7 +3864,7 @@
 			goto out;
 		}
 	
-		chain_regex(&curproxy->req_exp, preg, ACT_PASS, NULL);
+		chain_regex(&curproxy->req_exp, preg, ACT_PASS, NULL, NULL);
 		warnif_misplaced_reqxxx(curproxy, file, linenum, args[0]);
 	}
 	else if (!strcmp(args[0], "reqiallow")) {  /* allow a request if a header matches this regex ignoring case */
@@ -3890,7 +3890,7 @@
 			goto out;
 		}
 	
-		chain_regex(&curproxy->req_exp, preg, ACT_ALLOW, NULL);
+		chain_regex(&curproxy->req_exp, preg, ACT_ALLOW, NULL, NULL);
 		warnif_misplaced_reqxxx(curproxy, file, linenum, args[0]);
 	}
 	else if (!strcmp(args[0], "reqitarpit")) {  /* tarpit a request if a header matches this regex ignoring case */
@@ -3916,11 +3916,11 @@
 			goto out;
 		}
 	
-		chain_regex(&curproxy->req_exp, preg, ACT_TARPIT, NULL);
+		chain_regex(&curproxy->req_exp, preg, ACT_TARPIT, NULL, NULL);
 		warnif_misplaced_reqxxx(curproxy, file, linenum, args[0]);
 	}
 	else if (!strcmp(args[0], "reqadd")) {  /* add request header */
-		struct wordlist *wl;
+		struct cond_wordlist *wl;
 
 		if (curproxy == &defproxy) {
 			Alert("parsing [%s:%d] : '%s' not allowed in 'defaults' section.\n", file, linenum, args[0]);
@@ -3965,7 +3965,7 @@
 			goto out;
 		}
 	
-		err = chain_regex(&curproxy->rsp_exp, preg, ACT_REPLACE, strdup(args[2]));
+		err = chain_regex(&curproxy->rsp_exp, preg, ACT_REPLACE, strdup(args[2]), NULL);
 		if (err) {
 			Alert("parsing [%s:%d] : invalid character or unterminated sequence in replacement string near '%c'.\n",
 			      file, linenum, *err);
@@ -3997,7 +3997,7 @@
 			goto out;
 		}
 	
-		err = chain_regex(&curproxy->rsp_exp, preg, ACT_REMOVE, strdup(args[2]));
+		err = chain_regex(&curproxy->rsp_exp, preg, ACT_REMOVE, strdup(args[2]), NULL);
 		if (err) {
 			Alert("parsing [%s:%d] : invalid character or unterminated sequence in replacement string near '%c'.\n",
 			      file, linenum, *err);
@@ -4028,7 +4028,7 @@
 			goto out;
 		}
 	
-		err = chain_regex(&curproxy->rsp_exp, preg, ACT_DENY, strdup(args[2]));
+		err = chain_regex(&curproxy->rsp_exp, preg, ACT_DENY, strdup(args[2]), NULL);
 		if (err) {
 			Alert("parsing [%s:%d] : invalid character or unterminated sequence in replacement string near '%c'.\n",
 			      file, linenum, *err);
@@ -4060,7 +4060,7 @@
 			goto out;
 		}
 	    
-		err = chain_regex(&curproxy->rsp_exp, preg, ACT_REPLACE, strdup(args[2]));
+		err = chain_regex(&curproxy->rsp_exp, preg, ACT_REPLACE, strdup(args[2]), NULL);
 		if (err) {
 			Alert("parsing [%s:%d] : invalid character or unterminated sequence in replacement string near '%c'.\n",
 			      file, linenum, *err);
@@ -4091,7 +4091,7 @@
 			goto out;
 		}
 	
-		err = chain_regex(&curproxy->rsp_exp, preg, ACT_REMOVE, strdup(args[2]));
+		err = chain_regex(&curproxy->rsp_exp, preg, ACT_REMOVE, strdup(args[2]), NULL);
 		if (err) {
 			Alert("parsing [%s:%d] : invalid character or unterminated sequence in replacement string near '%c'.\n",
 			      file, linenum, *err);
@@ -4122,7 +4122,7 @@
 			goto out;
 		}
 	
-		err = chain_regex(&curproxy->rsp_exp, preg, ACT_DENY, strdup(args[2]));
+		err = chain_regex(&curproxy->rsp_exp, preg, ACT_DENY, strdup(args[2]), NULL);
 		if (err) {
 			Alert("parsing [%s:%d] : invalid character or unterminated sequence in replacement string near '%c'.\n",
 			      file, linenum, *err);
@@ -4131,7 +4131,7 @@
 		}
 	}
 	else if (!strcmp(args[0], "rspadd")) {  /* add response header */
-		struct wordlist *wl;
+		struct cond_wordlist *wl;
 
 		if (curproxy == &defproxy) {
 			Alert("parsing [%s:%d] : '%s' not allowed in 'defaults' section.\n", file, linenum, args[0]);
diff --git a/src/haproxy.c b/src/haproxy.c
index d26b0a7..2fdde61 100644
--- a/src/haproxy.c
+++ b/src/haproxy.c
@@ -700,6 +700,7 @@
 	struct switching_rule *rule, *ruleb;
 	struct redirect_rule *rdr, *rdrb;
 	struct wordlist *wl, *wlb;
+	struct cond_wordlist *cwl, *cwlb;
 	struct uri_auth *uap, *ua = NULL;
 	struct user_auth *user;
 	int i;
@@ -716,16 +717,16 @@
 		for (i = 0; i < HTTP_ERR_SIZE; i++)
 			chunk_destroy(&p->errmsg[i]);
 
-		list_for_each_entry_safe(wl, wlb, &p->req_add, list) {
-			LIST_DEL(&wl->list);
-			free(wl->s);
-			free(wl);
+		list_for_each_entry_safe(cwl, cwlb, &p->req_add, list) {
+			LIST_DEL(&cwl->list);
+			free(cwl->s);
+			free(cwl);
 		}
 
-		list_for_each_entry_safe(wl, wlb, &p->rsp_add, list) {
-			LIST_DEL(&wl->list);
-			free(wl->s);
-			free(wl);
+		list_for_each_entry_safe(cwl, cwlb, &p->rsp_add, list) {
+			LIST_DEL(&cwl->list);
+			free(cwl->s);
+			free(cwl);
 		}
 
 		list_for_each_entry_safe(cond, condb, &p->block_cond, list) {
diff --git a/src/proto_http.c b/src/proto_http.c
index d3c2b52..94022c8 100644
--- a/src/proto_http.c
+++ b/src/proto_http.c
@@ -2724,7 +2724,7 @@
 	struct http_msg *msg = &txn->req;
 	struct acl_cond *cond;
 	struct redirect_rule *rule;
-	struct wordlist *wl;
+	struct cond_wordlist *wl;
 	int del_ka, del_cl;
 
 	if (unlikely(msg->msg_state < HTTP_MSG_BODY)) {
@@ -4485,7 +4485,7 @@
 	struct http_txn *txn = &t->txn;
 	struct http_msg *msg = &txn->rsp;
 	struct proxy *cur_proxy;
-	struct wordlist *wl;
+	struct cond_wordlist *wl;
 
 	DPRINTF(stderr,"[%u] %s: session=%p b=%p, exp(r,w)=%u,%u bf=%08x bl=%d analysers=%02x\n",
 		now_ms, __FUNCTION__,
diff --git a/src/regex.c b/src/regex.c
index 7009366..1455fb4 100644
--- a/src/regex.c
+++ b/src/regex.c
@@ -1,7 +1,7 @@
 /*
  * Regex and string management functions.
  *
- * Copyright 2000-2006 Willy Tarreau <w@1wt.eu>
+ * Copyright 2000-2010 Willy Tarreau <w@1wt.eu>
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -23,7 +23,6 @@
 regmatch_t pmatch[MAX_MATCH];  /* rm_so, rm_eo for regular expressions */
 
 
-
 int exp_replace(char *dst, char *src, const char *str, const regmatch_t *matches)
 {
 	char *old_dst = dst;
@@ -98,7 +97,7 @@
 
 /* returns the pointer to an error in the replacement string, or NULL if OK */
 const char *chain_regex(struct hdr_exp **head, const regex_t *preg,
-			int action, const char *replace)
+			int action, const char *replace, void *cond)
 {
 	struct hdr_exp *exp;
 
@@ -117,6 +116,7 @@
 	exp->preg = preg;
 	exp->replace = replace;
 	exp->action = action;
+	exp->cond = cond;
 	*head = exp;
 
 	return NULL;