Add a user defined regexp function when initialising sqlite connection

pandasql/sqldf.py

@@ -90,11 +90,18 @@ def conn(self):
     def _init_connection(self, conn):
         if self.engine.name == 'postgresql':
             conn.execute('set search_path to pg_temp')
+        elif self.engine.name == 'sqlite':
+            conn.connection.connection.create_function("REGEXP", 2, regex)
 
     def _set_text_factory(self, dbapi_con, connection_record):
         dbapi_con.text_factory = str
 
 
+def regex(expr, item):
+    reg = re.compile(expr)
+    return reg.match(item) is not None
+
+
 def get_outer_frame_variables():
     """ Get a dict of local and global variables of the first outer frame from another file. """
     cur_filename = inspect.getframeinfo(inspect.currentframe()).filename