Extract substring in right format

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DavidL88
DavidL88 2021-11-9
评论： DavidL88 2021-11-9
How can I get the substring 22_right from the string below? The code below give me _22_right. I need it without the first '_'
str = 'Subject160/VSTMB_160_band_resample/data_22_right_average_210225_1827.mat'
EventName = regexp(str,'[1-9_]+_right','match')

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DGM
DGM 2021-11-9
Ran in:
Why include the extra _?
str = 'Subject160/VSTMB_160_band_resample/data_22_right_average_210225_1827.mat'
str = 'Subject160/VSTMB_160_band_resample/data_22_right_average_210225_1827.mat'
EventName = regexp(str,'[1-9]+_right','match')
EventName = 1×1 cell array
{'22_right'}

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