How to further extract a match values from a regexp match

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Sam Mahdi
Sam Mahdi . 2023년 6월 1일
댓글: Stephen23 . 2023년 6월 1일
Hello,
Had a quick question regarding regexp.
Let's say you have some string and you want to extract certain values from it
string='hello_1_goodbye_0.23_hi_1.55_exit_1000'
regexp(string,'hello_\d+\.*\d*','match')
>>>
1x1 cell array
('hello_1')
From here I'd like to just extract the number. I'm not super familiar with matlab, but in python for example, in a regex search you can use parenthesis than extract the specific group of your match
pattern='hello_(\d+\.*\d*)'
regex_search.group(1)='1'
So the pattern is the same and you are still matching hello_1, but from there you are able to extract only the numerical value

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Vilém Frynta
Vilém Frynta 2023년 6월 1일
If you use 'tokens' instead of match.
string = 'hello_2_goodbye_0.23_hi_1.55_exit_1000';
pattern = 'hello_(\d+\.*\d*)';
match = regexp(string, pattern, 'tokens');
num = match{1} % can be converted to number from a string
ans = 1×1 cell array
{'2'}
num = '2'
  댓글 수: 2
Stephen23
Stephen23 2023년 6월 1일
You might also want to use the ONCE option, to reduce the cell array nesting by one level:
S = 'hello_2_goodbye_0.23_hi_1.55_exit_1000';
P = 'hello_(\d+\.*\d*)';
C = regexp(S, P, 'tokens','once')
C = 1×1 cell array
{'2'}

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