Add process_path_regex rule type

docs/configuration/rule-set/headless-rule.md

@@ -57,6 +57,9 @@
       "process_path": [
         "/usr/bin/curl"
       ],
+      "process_path_regex": [
+        "^/usr/bin/.+"
+      ],
       "package_name": [
         "com.termux"
       ],
@@ -160,6 +163,16 @@ Match process name.
 
 Match process path.
 
+#### process_path_regex
+
+!!! question "Since sing-box 1.10.0"
+
+!!! quote ""
+
+    Only supported on Linux, Windows, and macOS.
+
+Match process path using regular expression.
+
 #### package_name
 
 Match android package name.