How to make correct Regex?

I have an output log from a system which i am looking to capture data from. The data is found in the printout in the following phrase:

"actualIntensity: Optional(8.24%)". I would like to capture the 8.24 part of this phrase.

I have been using

regexp(text,'actualIntensity: Optional\(([0-9]*\.[0-9]+)\%)','match')

But this returns the entire phrase.

How can i modify this regex to only return 8.24, without all the other text?

[Dyuman Joshi]

text is a built-in function. Naming variables (or scripts for that matters) using function names is not a good practice in MATLAB.

Best to change the variable name; a standard variable name in this context is txt.

Answer 1

[Voss]

Use 'tokens' instead of 'match'.

[Voss]

txt = "actualIntensity: Optional(8.24%)";

% original but with 'tokens'
regexp(txt,'actualIntensity: Optional\(([0-9]*\.[0-9]+)\%)','tokens')

ans = 1x1 cell array
    {["8.24"]}

% original but with 'tokens','once'
regexp(txt,'actualIntensity: Optional\(([0-9]*\.[0-9]+)\%)','tokens','once')

ans = "8.24"

% removing \ before % and combining the [0-9]
regexp(txt,'actualIntensity: Optional\(([0-9\.]+)%)','tokens','once')

ans = "8.24"

% capturing anything between ( and %) in the input string
regexp(txt,'actualIntensity: Optional\((.*)%)','tokens','once')

ans = "8.24"