Concatenate multiple strings in regex if seperated by nothing or whitespace

Question

I'm new to regex and I'm currently running into an issue when matching multiple consecutive strings.

I want to match strings: "this is a string". I managed to do that.

However, I would also like to match multiple strings if they are concatenated or separated by only whitespace: "this""is a string", or "this" "is" "one string".

The problem I'm having is that if I try to do that I also match "this" as "a string" (note the matched as this should be two separate strings).

I'm using flexc++ so I cannot use more fancy regex stuff like lookahead.

Currently I defined a string as (i used multiple different definitions this one seems the simplest):

string      \"(.*?)\"

and then try to match multiples using:

{string}[ \t]*{string}* 

Answer 1

This should work \"[^\"]*\"([ \t]*\"[^\"]*\")*

Or if give a string definition:

string          \"[^\"]*\"
concat_strings  {string}([ \t]*{string})*