avoid compiling the exclusion regex and use re.search directly

vermin/config.py

@@ -296,7 +296,7 @@ def add_exclusion(self, name):
     self.__exclusions.add(name)
 
   def add_exclusion_regex(self, pattern):
-    self.__exclusion_regex.add(re.compile(pattern))
+    self.__exclusion_regex.add(pattern)
 
   def add_exclusion_file(self, filename):
     try:
@@ -318,7 +318,7 @@ def exclusions(self):
     return res
 
   def exclusion_regex(self):
-    res = [p.pattern for p in self.__exclusion_regex]
+    res = list(self.__exclusion_regex)
     res.sort()
     return res
 
@@ -335,7 +335,7 @@ def is_excluded_codecs_encoding(self, name):
     return "ce={}".format(name) in self.__exclusions
 
   def is_excluded_by_regex(self, path):
-    return any(regex.search(path) for regex in self.__exclusion_regex)
+    return any(re.search(regex, path) for regex in self.__exclusion_regex)
 
   def make_paths_absolute(self):
     return self.__make_paths_absolute