diff --git a/pygrok/pygrok.py b/pygrok/pygrok.py
index 142d122..6f48a10 100644
--- a/pygrok/pygrok.py
+++ b/pygrok/pygrok.py
@@ -16,6 +16,7 @@ def __init__(self, pattern, custom_patterns_dir=None, custom_patterns={}, fullma
         self.custom_patterns_dir = custom_patterns_dir
         self.predefined_patterns = _reload_patterns(DEFAULT_PATTERNS_DIRS)
         self.fullmatch = fullmatch
+        self.regex_pattern = None
 
         custom_pats = {}
         if custom_patterns_dir is not None:
@@ -85,6 +86,7 @@ def _load_search_pattern(self):
             if re.search('%{\w+(:\w+)?}', py_regex_pattern) is None:
                 break
 
+        self.regex_pattern = py_regex_pattern
         self.regex_obj = re.compile(py_regex_pattern)
 
 def _wrap_pattern_name(pat_name):