(?:[^.]|^)((?:\b(?:25[0-5]|2[0-4][0-9]|1[0-9]{2}|0?[0-9]?[0-9])\.){3}(?:\b(?:25[0-5]|2[0-4][0-9]|1[0-9]{2}|0?[0-9]?[0-9]))\b(?=[^.:/]|$))
this highlights correct IPv4 address, but if at front there are any special characters, it also highlights the same.
11.22.44.33 - OK
@11.22.44.33 - also highlights 1st character - @, which I don't want. I just want to highlight rest of the part
The @ will match your REGEX, but it won't be captured in your capturing group.
I'm not sure what software you're using it with, but group 1 will contain just the IP address, and not the @.
If you simply don't want it to match at all for whatever reason, remove the first part of your REGEX:
(?:[^.]|^)
As this matches anything that isn't a literal . or the beginning of a line/string. I'm not sure you actually need this part anyway.
