core: fix memory leak in regex matching when evaluating expression

ChangeLog

@@ -11,6 +11,7 @@ http://weechat.org/files/releasenotes/ReleaseNotes-devel.html[release notes]
 
 == Version 0.4.3 (under dev)
 
+* core: fix memory leak in regex matching when evaluating expression
 * core: add signals "signal_sighup" and "signal_sigwinch" (terminal resized)
 * core: add command /print, add support of more escaped chars in command
   "/input insert"

src/core/wee-eval.c

@@ -436,6 +436,7 @@ eval_compare (const char *expr1, int comparison, const char *expr2)
             goto end;
         }
         rc = (regexec (&regex, expr1, 0, NULL, 0) == 0) ? 1 : 0;
+        regfree (&regex);
         if (comparison == EVAL_COMPARE_REGEX_NOT_MATCHING)
             rc ^= 1;
         goto end;