Extract Data from .txt File

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Alfredo Serna
Alfredo Serna on 27 Oct 2021
Commented: Alfredo Serna on 28 Oct 2021
Hi, someone can help me extract data from this .txt File? I'm interested in extracting the numeric values of "PeakEvm" that appears in the file.
I have tried to use textscan, pattern, extract and extractBetween but they are useless for this task.

Accepted Answer

C B
C B on 27 Oct 2021
Edited: C B on 27 Oct 2021
alltext = fileread('Datos_SSB_624_MHz_7_dB.txt');
% extract data between {"peakEvm": and },
allmatches = regexp(alltext,'(?<={"peakEvm":).*?(?=},)','match')
allmatches = 1×16 cell array
{'{"percent":12.372359275817871,"subcarrierNumber":753,"symbolNumber":5'} {'{"percent":13.889286994934082,"subcarrierNumber":522,"symbolNumber":3'} {'{"percent":9.418230056762695,"subcarrierNumber":574,"symbolNumber":2'} {'{"percent":9.726147651672363,"subcarrierNumber":694,"symbolNumber":4'} {'{"percent":13.805439949035645,"subcarrierNumber":517,"symbolNumber":11'} {'{"percent":14.057321548461914,"subcarrierNumber":750,"symbolNumber":9'} {'{"percent":8.600445747375488,"subcarrierNumber":696,"symbolNumber":8'} {'{"percent":8.529023170471191,"subcarrierNumber":698,"symbolNumber":10'} {'{"percent":14.28252124786377,"subcarrierNumber":517,"symbolNumber":19'} {'{"percent":16.036340713500977,"subcarrierNumber":516,"symbolNumber":18'} {'{"percent":8.51211929321289,"subcarrierNumber":579,"symbolNumber":16'} {'{"percent":8.950516700744629,"subcarrierNumber":695,"symbolNumber":18'} {'{"percent":14.643827438354492,"subcarrierNumber":517,"symbolNumber":25'} {'{"percent":15.098423957824707,"subcarrierNumber":519,"symbolNumber":25'} {'{"percent":9.247054100036621,"subcarrierNumber":573,"symbolNumber":22'} {'{"percent":9.152688980102539,"subcarrierNumber":696,"symbolNumber":24'}
% extract data between {"percent": and ,
num1 = regexp(allmatches,'(?<={"percent":).*?(?=,)','match');
% extract data between "subcarrierNumber": and ,
num2 = regexp(allmatches,'(?<="subcarrierNumber":).*?(?=,)','match');
% extract data between "symbolNumber": and end
num3 = regexp(allmatches,'(?<="symbolNumber":).*?(?=)','match');
vertcat(num1{:})
ans = 16×1 cell array
{'12.372359275817871'} {'13.889286994934082'} {'9.418230056762695' } {'9.726147651672363' } {'13.805439949035645'} {'14.057321548461914'} {'8.600445747375488' } {'8.529023170471191' } {'14.28252124786377' } {'16.036340713500977'} {'8.51211929321289' } {'8.950516700744629' } {'14.643827438354492'} {'15.098423957824707'} {'9.247054100036621' } {'9.152688980102539' }
vertcat(num2{:})
ans = 16×1 cell array
{'753'} {'522'} {'574'} {'694'} {'517'} {'750'} {'696'} {'698'} {'517'} {'516'} {'579'} {'695'} {'517'} {'519'} {'573'} {'696'}
vertcat(num3{:})
ans = 16×1 cell array
{'5'} {'3'} {'2'} {'4'} {'1'} {'9'} {'8'} {'1'} {'1'} {'1'} {'1'} {'1'} {'2'} {'2'} {'2'} {'2'}

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