Parsing everything between quotation using regular expression

I m working on a code that parse whatever occur between the quations as shown in my example below

raw="square format" tag_id=

I want parse only between the quotations (highlighted in bold) "whateverhere even space or dots" parse me

your help is highly appreciated

[per isakson]

• What has tag_id= to do with the question?
• raw="square format" tag_id= is that a sample string of text, out of which you want to extract square format?

[Walter Roberson]

You say "whateverhere even spaces or dots". Does that include the possibility of double-quotes ?

Answer 1

[Ken Atwell]

I think you want:

 raw='"square format" tag_id='
 regexp(raw, '"(.*?)"', 'tokens')

That gives you a cell array of all text found within double quotes, and nothing else. KEN

[sst]

Hello Ken, by any chance do you have one for a slight variation of this problem? I was wondering if there's a good way to exclude the escape sequence \" directly in the regular expression pattern.

raw = ' "This is a sample string \" with an escape sequence" 0 1 abcdef';

[Walter Roberson]

regexp(raw, '"(.*?)(<!\\)"', 'tokens')

However, this will fail if the \ is itself escaped. For example in

'  "This is a sample string \\" with an escaped escape sequence" 0 1 abcdef'

then that is not really an \" since the \\ is marked as literal.

Parsing through to check for odd numbers of \ is a bit more complicated.

[sst]

Hello Walter, unfortunately that didn't work (R2018b). I only need to include the \" escape sequence, to avoid the ambiguity involved in the use of double quotes.

>> raw = ' "This is a sample string \" with an escape sequence" 0 1 abcdef';
>> regexp(raw, '"(.*?)(<!\\)"', 'tokens')

ans =

  0×0 empty cell array

[Guillaume]

sst, please start a fresh question rather than commenting on a 5 year old answer.

[Walter Roberson]

regexp(raw, '"(.*?)(?<!\\)"', 'tokens')

You might want to add the 'once' option if you only expect one occurance.