[R] extract number from a mixture of character and number

[york8866]

Hi, all,

I have a column like the following:
ID                                  TIME
sub_001                         0
sub_001                         24
sub_002                         0
sub_002                        24
sub_003                         0
sub_003                        24
sub_004                         0
sub_005                        24
..
..

is there a way for me to just extract the numeric numbers from the ID
column, omitting sub_?

thanks,


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