Automatically delete the temp file on startup, change the pattern

The pattern or the pattern.sub is not correct and will not always match entire column
This works fine for most items, but school districts are noted for cropping this error up

main.py

@@ -48,6 +48,7 @@ def find_index(row=None, col=None):
     return index
 
 os.rename(config['import_path'], config['import_path']+'.orig') # Store the original import_path in a backup file
+os.remove(config['temp_path']) # Delete the temp file if it exists for some reason
 
 with open(config['partner_path'], 'r') as partner_csv:
     reader = csv.reader(partner_csv)
@@ -67,7 +68,7 @@ with open(config['partner_path'], 'r') as partner_csv:
     partner_ids = {rows[name]:rows[id] for rows in reader} # Build a dict containing the company names as the keys and the __export__IDs as values
     reader = None
 
-    # Open both the import_csv and temp_csv files
+    # Open both the import_csv (read-only) and temp_csv (write-only) files
     with open(config['import_path']+'.orig', 'r') as import_csv, open(config['temp_path'], 'w') as temp_csv:
         reader = csv.reader(import_csv)
         writer = csv.writer(temp_csv, lineterminator='\n') 
@@ -83,7 +84,8 @@ with open(config['partner_path'], 'r') as partner_csv:
             writer.writerow(first_row)
             for lines in reader:
                 # Taken from http://stackoverflow.com/a/2400577/5727514 and modified to support what I need 
-                pattern = re.compile('|'.join(partner_ids.keys()))
+                pattern = re.compile(r'\b(' + '|'.join(partner_ids.keys()) + r')\b')
+                #pattern = re.compile('|'.join(partner_ids.keys()))
                 lines[col] = pattern.sub(lambda x: partner_ids[x.group()], lines[col])
 
                 writer.writerow(lines)