regex101: failed attempt

Pro

msg-type="the literal text msg-type=" (case sensitive)

Negative Lookahead(?!(?:JOIN|INFO|TOPIC))

Non-Capturing Group(?:JOIN|INFO|TOPIC)

1st AlternativeJOIN

JOINthe literal text JOIN (case sensitive)

2nd AlternativeINFO

INFOthe literal text INFO (case sensitive)

3rd AlternativeTOPIC

TOPICthe literal text TOPIC (case sensitive)

Negated Character Class[^"]+

+matches at least one character outside the set below:

"the literal " (34₁₀ / 42₈ / 22₁₆)

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

25 tokens

Regular Expression

msg-type="(?!(?:JOIN|INFO|TOPIC))[^"]+"

New

msg-type="codePRIVMSGcode"
msg-type="PRIVMSG"
msg-type="PRIVMSGcode"
msg-type="codePRIVMSG"
msg-type="codeJOINcode"
msg-type="JOIN"
msg-type="JOINcode"
msg-type="codeJOIN"
msg-type="codeTOPICcode"
msg-type="codeINFOcode"
msg-type="PRIVMSG"
msg-type="OTHER"

Substitution

msg-type="codePRIVMSGcode"
msg-type="PRIVMSG"
msg-type="PRIVMSGcode"
msg-type="codePRIVMSG"
msg-type="codeJOINcode"
msg-type="JOIN"
msg-type="JOINcode"
msg-type="codeJOIN"
msg-type="codeTOPICcode"
msg-type="codeINFOcode"
msg-type="PRIVMSG"
msg-type="OTHER"