ngx_regex_exec() calling optimiztion:

*) change NGX_REGEX_NO_MATCHED to PCRE_ERROR_NOMATCH
*) declare ngx_regex_exec() as #define
*) optimize SSI regex a little

src/core/ngx_regex.c

diff --git a/src/core/ngx_regex.c b/src/core/ngx_regex.c
index be2dae7..c5a4952 100644
--- a/src/core/ngx_regex.c
+++ b/src/core/ngx_regex.c
@@ -99,22 +99,6 @@
 
 
 ngx_int_t
-ngx_regex_exec(ngx_regex_t *re, ngx_str_t *s, int *captures, ngx_int_t size)
-{
-    int  rc;
-
-    rc = pcre_exec(re, NULL, (const char *) s->data, s->len, 0, 0,
-                   captures, size);
-
-    if (rc == -1) {
-        return NGX_REGEX_NO_MATCHED;
-    }
-
-    return rc;
-}
-
-
-ngx_int_t
 ngx_regex_exec_array(ngx_array_t *a, ngx_str_t *s, ngx_log_t *log)
 {
     ngx_int_t         n;

src/core/ngx_regex.h

diff --git a/src/core/ngx_regex.h b/src/core/ngx_regex.h
index e31470f..4a48572 100644
--- a/src/core/ngx_regex.h
+++ b/src/core/ngx_regex.h
@@ -14,7 +14,7 @@
 #include <pcre.h>
 
 
-#define NGX_REGEX_NO_MATCHED  -1000
+#define NGX_REGEX_NO_MATCHED  PCRE_ERROR_NOMATCH   /* -1 */
 
 #define NGX_REGEX_CASELESS    PCRE_CASELESS
 
@@ -30,8 +30,11 @@
 ngx_regex_t *ngx_regex_compile(ngx_str_t *pattern, ngx_int_t options,
     ngx_pool_t *pool, ngx_str_t *err);
 ngx_int_t ngx_regex_capture_count(ngx_regex_t *re);
-ngx_int_t ngx_regex_exec(ngx_regex_t *re, ngx_str_t *s, int *captures,
-    ngx_int_t size);
+
+#define ngx_regex_exec(re, s, captures, size)                                \
+    pcre_exec(re, NULL, (const char *) (s)->data, (s)->len, 0, 0,            \
+              captures, size)
+
 ngx_int_t ngx_regex_exec_array(ngx_array_t *a, ngx_str_t *s, ngx_log_t *log);
 
 

src/http/modules/ngx_http_ssi_filter_module.c

diff --git a/src/http/modules/ngx_http_ssi_filter_module.c b/src/http/modules/ngx_http_ssi_filter_module.c
index d03e584..f06994d 100644
--- a/src/http/modules/ngx_http_ssi_filter_module.c
+++ b/src/http/modules/ngx_http_ssi_filter_module.c
@@ -2468,7 +2468,7 @@
 
         rc = ngx_regex_exec(regex, &left, NULL, 0);
 
-        if (rc != NGX_REGEX_NO_MATCHED && rc < 0) {
+        if (rc < NGX_REGEX_NO_MATCHED) {
             ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
                           ngx_regex_exec_n " failed: %d on \"%V\" using \"%V\"",
                           rc, &left, &right);