extract word before and after character

i want to extract string before "(" and after " " or "," (space comma)

example:

input: pilo(52),iko(54);
result:
pilo
iko

[the cyclist]

Can you be more specific about what MATLAB class your input is? Here are some examples

in = ["pilo(52)","iko(54)"]

in = 1×2 string array
    "pilo(52)"    "iko(54)"

in = {"pilo(52)","iko(54)"}

in = 1×2 cell array
    {["pilo(52)"]}    {["iko(54)"]}

in = {'pilo(52)','iko(54)'}

in = 1×2 cell array
    {'pilo(52)'}    {'iko(54)'}

in = "pilo(52),iko(54)"

in = "pilo(52),iko(54)"

in = 'pilo(52),iko(54)'

in = 'pilo(52),iko(54)'

[Walter Roberson]

Is it ever possible for the input to have nested () ? For example,

pilo(sembei(93) fedora(s3))

Is it every possible for there to be digits in what is extracted? Is it ever possible for the part in () to be non-digits?

pilo17(52),iko(pippin)

[aldo]

hi, in " () " there is only number :

(34)

(32)

(1)

[aldo]

other example : (the format data is array cell)

g(1,:)={'input: pilo(52),iko(54)' }

g(2,:)={'input:iko(54)' }

g(3,:)={'input:pilo(52),iko(54)' }

g(4,:)={'input:pilo(52),iko(54),op(23)' }

in one cell there can be several words

finally I want to capture this:

in g(1,:) :

pilo 52

iko 54

in g(2,:)

iko 54

in g(3,:)

pilo 52

iko 54

in g(4,:)

pilo 52

iko 54

op 23

Answer 1

[Stephen23]

C = {'input: pilo(52),iko(54)'; 'input:iko(54)'; 'input:pilo(52),iko(54)'; 'input:pilo(52),iko(54),op(23)'}

C = 4×1 cell array
    {'input: pilo(52),iko(54)'      }
    {'input:iko(54)'                }
    {'input:pilo(52),iko(54)'       }
    {'input:pilo(52),iko(54),op(23)'}

X = regexp(C,'(\w+)\((\d+)','tokens');
X = cellfun(@(c)vertcat(c{:}),X,'uni',0)

X = 4×1 cell array
    {2×2 cell}
    {1×2 cell}
    {2×2 cell}
    {3×2 cell}

X{:}

ans = 2×2 cell array
    {'pilo'}    {'52'}
    {'iko' }    {'54'}

ans = 1×2 cell array
    {'iko'}    {'54'}

ans = 2×2 cell array
    {'pilo'}    {'52'}
    {'iko' }    {'54'}

ans = 3×2 cell array
    {'pilo'}    {'52'}
    {'iko' }    {'54'}
    {'op'  }    {'23'}

However... regular expressions are very precise things. Writing them well requires understanding the precise conditions that they should match. Thus usually when someone posts a question with "simplified" text it just delays getting a working solution.

[aldo]

correct! thank you

[aldo]

Can I ask you for further help?

i find this array cell

{'pilo'} {'52'}

{'iko' } {'54'}

{'op' } {'23'}

now I have to use these found names to capture other words:

example:

xx1(pilo,ohlcvalues) and xx1(op,ohlcvalues)=false

xx2(+iko,ohlcvalues)

i want to catch xx1 and xx2

rules: (example using 'pilo')

(pilo, xxc )

(+pilo, xvs )

(-pilo, xcs )

i want to catch the name befone '('

In this example :

xx1(pilo, .. ) ======>xx1

xx2(+pilo, .. ) ======>xx2

xx3(-pilo, .. ) ======>xx3

the new cell array created must be:

{'pilo'} {'52'} {'xx1'}

i read https://it.mathworks.com/help/matlab/ref/regexp.html but it's so difficult