diff --git a/shadowsocksr-libev/patches/104-fix-use-after-free.patch b/shadowsocksr-libev/patches/104-pointer-used-after-free.patch
similarity index 91%
rename from shadowsocksr-libev/patches/104-fix-use-after-free.patch
rename to shadowsocksr-libev/patches/104-pointer-used-after-free.patch
index d00d549e3..9081d5560 100644
--- a/shadowsocksr-libev/patches/104-fix-use-after-free.patch
+++ b/shadowsocksr-libev/patches/104-pointer-used-after-free.patch
@@ -1,6 +1,6 @@
 --- a/server/server.c
 +++ b/server/server.c
-@@ -1942,11 +1942,11 @@ main(int argc, char **argv)
+@@ -1942,12 +1942,12 @@
              text = (char*)malloc(strlen(protocol) - 11);
              memcpy(text, protocol, strlen(protocol) - 11);
              int length = strlen(protocol) - 11;
@@ -9,7 +9,8 @@
              memset(protocol, 0x00, length);
              memcpy(protocol, text, length);
              LOGI("protocol compatible enable, %s", protocol);
-+            free(protocol);
              free(text);
++            free(protocol);
              protocol_compatible = 1;
          }
+     }
diff --git a/shadowsocksr-libev/src/server/Makefile.in b/shadowsocksr-libev/src/server/Makefile.in
index 3bfa53eaa..17dad9597 100644
--- a/shadowsocksr-libev/src/server/Makefile.in
+++ b/shadowsocksr-libev/src/server/Makefile.in
@@ -105,7 +105,7 @@ am__aclocal_m4_deps = $(top_srcdir)/m4/ax_pthread.m4 \
 	$(top_srcdir)/m4/libtool.m4 $(top_srcdir)/m4/ltoptions.m4 \
 	$(top_srcdir)/m4/ltsugar.m4 $(top_srcdir)/m4/ltversion.m4 \
 	$(top_srcdir)/m4/lt~obsolete.m4 $(top_srcdir)/m4/mbedtls.m4 \
-	$(top_srcdir)/m4/openssl.m4 $(top_srcdir)/m4/pcre.m4 \
+	$(top_srcdir)/m4/openssl.m4 $(top_srcdir)/m4/pcre2.m4 \
 	$(top_srcdir)/m4/polarssl.m4 \
 	$(top_srcdir)/m4/stack-protector.m4 $(top_srcdir)/m4/zlib.m4 \
 	$(top_srcdir)/libev/libev.m4 $(top_srcdir)/configure.ac
diff --git a/shadowsocksr-libev/src/server/rule.c b/shadowsocksr-libev/src/server/rule.c
index 8aae04ea7..41ba5e7d9 100644
--- a/shadowsocksr-libev/src/server/rule.c
+++ b/shadowsocksr-libev/src/server/rule.c
@@ -82,14 +82,28 @@ int
 init_rule(rule_t *rule)
 {
     if (rule->pattern_re == NULL) {
-        const char *reerr;
-        int reerroffset;
+        int errornumber;
+        PCRE2_SIZE erroroffset;
+        rule->pattern_re = pcre2_compile(
+            (PCRE2_SPTR)rule->pattern,   /* the pattern */
+            PCRE2_ZERO_TERMINATED,       /* indicates pattern is zero-terminated */
+            0,                           /* default options */
+            &errornumber,                /* for error number */
+            &erroroffset,                /* for error offset */
+            NULL);                       /* use default compile context */
 
-        rule->pattern_re =
-            pcre_compile(rule->pattern, 0, &reerr, &reerroffset, NULL);
         if (rule->pattern_re == NULL) {
-            LOGE("Regex compilation of \"%s\" failed: %s, offset %d",
-                 rule->pattern, reerr, reerroffset);
+            PCRE2_UCHAR errbuffer[512];
+            pcre2_get_error_message(errornumber, errbuffer, sizeof(errbuffer));
+            LOGE("PCRE2 regex compilation failed at offset %d: %s\n", (int)erroroffset,
+                 errbuffer);
+            return 0;
+        }
+
+        rule->pattern_re_match_data = pcre2_match_data_create_from_pattern(rule->pattern_re, NULL);
+
+        if (rule->pattern_re_match_data == NULL) {
+            ERROR("PCRE2: the memory for the block could not be obtained");
             return 0;
         }
     }
@@ -109,8 +123,15 @@ lookup_rule(const struct cork_dllist *rules, const char *name, size_t name_len)
 
     cork_dllist_foreach_void(rules, curr, next) {
         rule_t *rule = cork_container_of(curr, rule_t, entries);
-        if (pcre_exec(rule->pattern_re, NULL,
-                      name, name_len, 0, 0, NULL, 0) >= 0)
+        if (pcre2_match(
+                rule->pattern_re,            /* the compiled pattern */
+                (PCRE2_SPTR)name,            /* the subject string */
+                name_len,                    /* the length of the subject */
+                0,                           /* start at offset 0 in the subject */
+                0,                           /* default options */
+                rule->pattern_re_match_data, /* block for storing the result */
+                NULL                         /* use default match context */
+                ) >= 0)
             return rule;
     }
 
@@ -131,7 +152,13 @@ free_rule(rule_t *rule)
         return;
 
     ss_free(rule->pattern);
-    if (rule->pattern_re != NULL)
-        pcre_free(rule->pattern_re);
+    if (rule->pattern_re != NULL) {
+        pcre2_code_free(rule->pattern_re);                    /* data and the compiled pattern. */
+        rule->pattern_re            = NULL;
+    }
+    if (rule->pattern_re_match_data != NULL) {
+        pcre2_match_data_free(rule->pattern_re_match_data);   /* Release memory used for the match */
+        rule->pattern_re_match_data = NULL;
+    }
     ss_free(rule);
 }
diff --git a/shadowsocksr-libev/src/server/rule.h b/shadowsocksr-libev/src/server/rule.h
index 015bc42b5..84a89af67 100644
--- a/shadowsocksr-libev/src/server/rule.h
+++ b/shadowsocksr-libev/src/server/rule.h
@@ -33,17 +33,27 @@
 
 #include <libcork/ds.h>
 
-#ifdef HAVE_PCRE_H
-#include <pcre.h>
-#elif HAVE_PCRE_PCRE_H
-#include <pcre/pcre.h>
-#endif
+/*
+ * The PCRE2_CODE_UNIT_WIDTH macro must be defined before including pcre2.h.
+ * For a program that uses only one code unit width, setting it to 8, 16, or 32
+ * makes it possible to use generic function names such as pcre2_compile(). Note
+ * that just changing 8 to 16 (for example) is not sufficient to convert this
+ * program to process 16-bit characters. Even in a fully 16-bit environment, where
+ * string-handling functions such as strcmp() and printf() work with 16-bit
+ * characters, the code for handling the table of named substrings will still need
+ * to be modified.
+ */
+/* we only need to support ASCII chartable, thus set it to 8 */
+#define PCRE2_CODE_UNIT_WIDTH 8
+
+#include <pcre2.h>
 
 typedef struct rule {
     char *pattern;
 
     /* Runtime fields */
-    pcre *pattern_re;
+    pcre2_code *pattern_re;
+    pcre2_match_data *pattern_re_match_data;
 
     struct cork_dllist_item entries;
 } rule_t;