LGTM.com - false positive - unmatchable dollar in regular expression #2403
Description
Description of the false positive
"Unmatchable dollar in regular expression" is raised against the following regex in Python:
r'((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)(\.|$)){4}$'
This regex is for an IP address and works properly.
The documentation for Unmatchable dollar in regular expression states
Regular expressions containing a dollar '$' in the middle cannot be matched, whatever the input.
This is not the case in the above regex where the middle '$' is matched at the end of the fourth digits group.
URL to the alert on the project page on LGTM.com