regex with look around to match following - regex-lookarounds

Question

need to write regex to match quoted and unquoted item
\"[a-z,A-Z]+.*\"|\b[a-z,A-Z,0-9]+.*(?<=[\n+\r+\s+]})
sample data for matching
"visitor block" {
option {
disable-server-response no;
}
source any;
category any;
tag guest-in;
}
visitor_Internet {
option {
disable-server-response no;
}
source-user any;
action allow;
}
"Deny guest" {
option {
disable-server-response no;
}
action deny;
tag guest;
}
By regex I need to select string in double quotes (visitor block,Deny guest) and also string not in quotes such that visitor_Internet.only name string to capture

Answer 1

I assume you want
to capture a substring at the start of a line
that is inside double quotes and starts with an ASCII letter
and then capture all text from the { until the } that is followed with line break and any whitespaces followed with the first group pattern, or at the end of string.
You may use
(?ms)^\s*"([a-zA-Z][^"]*)"\s*{(.*?)}(?=\h*\n\s*"[a-zA-Z][^"]*"\s*{|\s*\z)
See the regex demo
NOTE: This won't work if there are non-matching lines between the blocks.
Details
(?ms) - multiline and dotall modes on
^ - start of a line
\s* - 0 or more whitespaces
" - a "
([a-zA-Z][^"]*) - Group 1: an ASCII letter and then 0+ chars other than "
" - a " char
\s* - 0+ whitespaces
{ - a { char
(.*?) - Group 2: any 0+ chars, as few as possible
} - a } char that is followed with
(?=\h*\n\s*"[a-zA-Z][^"]*"\s*{|\s*\z) - either
\h*\n\s*"[a-zA-Z][^"]*"\s*{ - 0+ horizontal whitespaces, a newline, 0+ whitespaces, ", an ASCII letter, 0+ chars other than ", " and then 0+ whitespaces and {
| - or
\s*\z - 0+ whitespaces at the very end of the string.