--- a/src/http/ngx_http_variables.h
+++ b/src/http/ngx_http_variables.h
@@ -59,6 +59,31 @@ ngx_int_t ngx_http_variable_unknown_head
 #define ngx_http_clear_variable(r, index) r->variables0[index].text.data = NULL;
 
 
+#if (NGX_PCRE)
+
+typedef struct {
+    ngx_uint_t                    capture;
+    ngx_int_t                     index;
+} ngx_http_regex_variable_t;
+
+
+typedef struct {
+    ngx_regex_t                  *regex;
+    ngx_uint_t                    ncaptures;
+    ngx_http_regex_variable_t    *variables;
+    ngx_uint_t                    nvariables;
+    ngx_str_t                     name;
+} ngx_http_regex_t;
+
+
+ngx_http_regex_t *ngx_http_regex_compile(ngx_conf_t *cf,
+    ngx_regex_compile_t *rc);
+ngx_int_t ngx_http_regex_exec(ngx_http_request_t *r, ngx_http_regex_t *re,
+    ngx_str_t *s);
+
+#endif
+
+
 ngx_int_t ngx_http_variables_add_core_vars(ngx_conf_t *cf);
 ngx_int_t ngx_http_variables_init_vars(ngx_conf_t *cf);