extract numbers from a string.

2022 9 12
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更新时间：2022 9 13
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str = "sensor_serials": {"H1": "3637", "H2": "3638", "H3": "2787"},
I would like to extract the number 3637, 3638, and 2787 from the above string. How should I do it? Thanks!

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Star Strider
Star Strider 2022-9-12
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Something is wrong with that because it throws this error —
str = "sensor_serials": {"H1": "3637", "H2": "3638", "H3": "2787"}
Operator ':' is not supported for operands of type 'string'.

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Voss
Voss 2022-9-12
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str = '"sensor_serials": {"H1": "3637", "H2": "3638", "H3": "2787"}'
str = '"sensor_serials": {"H1": "3637", "H2": "3638", "H3": "2787"}'
numbers = regexp(str,'"(\d+)"','tokens');
numbers = [numbers{:}]
numbers = 1×3 cell array
{'3637'} {'3638'} {'2787'}
numbers = str2double(numbers)
numbers = 1×3
3637 3638 2787

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Hiro Yoshino
Hiro Yoshino 2022-9-12
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You can use pattern:
pat = digitsPattern(4); % Pattern
str = '"sensor_serials": {"H1": "3637", "H2": "3638", "H3": "2787"}'
str = '"sensor_serials": {"H1": "3637", "H2": "3638", "H3": "2787"}'
numbers = extract(str,pat);
string(numbers)
ans = 3×1 string array
"3637" "3638" "2787"

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Jasmine Zhu
Jasmine Zhu 2022-9-13
Thank you for your reply. Unfortunately my matlab doesn't support digitsPattern().

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