I have a regex that works well for PCRE to detect a certain word without any special characters ahead of it. For example detecting T4 would work well with (?!\S)T4(?!\S).
Match: T4
Not a match: ^T4 or =T4
However, I'm not certain if negative look behinds are supported by Go Regex. Is there something equivalent that can be used in Go Regex?
Neither negative lookbehinds nor lookarounds in general are supported by Golang regex.
You can check if there is a word in between whitespaces or start/end of string using
pattern := regexp.MustCompile(`(?:\s|^)T4(?:\s|$)`)
where
(?:\s|^) - a non-capturing group matching either a whitespace or start of stringT4 - a literal substring(?:\s|$) - a non-capturing group matching either a whitespace or end of string.