Allow deleting log filter

Author: elicn

qiling/core.py

@@ -452,12 +452,17 @@ def filter(self) -> str:
         return '' if lf is None else lf._filter.pattern
 
     @filter.setter
-    def filter(self, regex: str):
-        if self._log_filter is None:
-            self._log_filter = RegexFilter(regex)
+    def filter(self, regex: Optional[str]):
+        if regex is None:
+            if self._log_filter is not None:
+                self.log.removeFilter(self._log_filter)
 
-            self.log.addFilter(self._log_filter)
         else:
+            if self._log_filter is None:
+                self._log_filter = RegexFilter(regex)
+
+                self.log.addFilter(self._log_filter)
+
             self._log_filter.update_filter(regex)
 
     @property

qiling/log.py

@@ -84,11 +84,6 @@ def get_thread_tag(self, tid: str) -> str:
         return f'{COLOR.GREEN}{s}{COLOR.ENDC}'
 
 class RegexFilter(logging.Filter):
-    def __init__(self, regexp: str):
-        super().__init__()
-
-        self.update_filter(regexp)
-
     def update_filter(self, regexp: str):
         self._filter = re.compile(regexp)