Masking Prefix and Suffix should not be escaped

[jian]

The following escapes the prefix and suffix.

Drain3/drain3/template_miner.py

Lines 306 to 307 in 76d12de

 escaped_prefix = re.escape(self.masker.mask_prefix) 
 escaped_suffix = re.escape(self.masker.mask_suffix) 

However, they are used in str.replace, which only does simple string replacement.

Drain3/drain3/template_miner.py

Lines 312 to 316 in 76d12de

 search_str = escaped_prefix + re.escape(mask_name) + escaped_suffix 
 while True: 
     rep_str = create_capture_regex(mask_name) 
     # Replace one-by-one to get a new param group name for each replacement. 
     template_regex_new = template_regex.replace(search_str, rep_str, 1) 

Thus, if the prefix and suffix contained escaped characters, e.g. {{ and }} would become \\{\\{ and \\}\\}, the replacement would fail, and the constructed pattern will not match any parameteres.

[jian]

I missed the line right after that also escapes the template...