Simplest way to extract multiple tokens from multiple strings and store each type of token in it's own cell array?

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Philip M 2020-1-21

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编辑： Philip M 2020-1-21

So lets say I have:

str1="something function abc (a, b, c)"
str2="something function def (d, e, f)"
str3="something else function ghi (g, h, i)"
strarray=[str1;str2;str3]

and I want to end up with the following two string arrays:

functions={"abd"
           "def"
           "ghi"}
       
arguments={"a, b, c"
           "d, e, f"
           "g, h, i"}

What is the simplest way to accomplish this? The simplest thing I've come up with so far is this:

[alltok]=regexp(strarray,'function (\w*) \(([^\)]*)','tokens','once')
alltok2=[alltok{:}]'
functions=alltok2(1:2:end)
arguments=alltok2(2:2:end)

Is there a way to reduce this to 2 lines or even 1 line? If it would help to store the strings as something other than a string array then that's not a problem.

EDIT:

I just figured out how to get it down to two lines:

functions=string(regexp(strarray,'function (\w*)','tokens'))
arguments=string(regexp(strarray,'function \w* \(([^\)]*)','tokens'))

or one big ugly line:

[functions arguments]=deal(string(regexp(strarray,'function (\w*)','tokens')),string(regexp(strarray,'function \w* \(([^\)]*)','tokens')))

Is it time to leave good enough alone or is there a more intuitive way of doing this? In the first option I posted, regexp outputs a 3x1 cell array of 1x2 string arrays. I feel like there should be some simple way to unpack that into two separate string arrays.

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Answer 1

woahs 2020-1-21

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Not entirely sure what you're asking for since it sounds like you were able to achieve what you wanted but here's a way to do it with fewer lines of code, albiet possibly more confusing:

[alltok]=regexp(strarray,'function (\w*) \(([^\)]*)','tokens','once')
[functions, arguments] = cellfun(@(x) deal(x{1}, x{2}), alltok, 'UniformOutput', false)

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Philip M 2020-1-21

编辑：Philip M 2020-1-21

Thanks, this is helpful. This also answers my underlying question of how to unpack a cell array of string arrays. For this specific operation I think my two-line option is perferable, but if I ever have lots of tokens then your code would be better. I hadn't considered using deal in conjunction with cellfun, I'm sure I'll use that in the future.

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