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Regular Expressions using regexp

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Hello, I have some problem with understanding regexp expression
I have some names: ["T_24_UZK500.txt"; "FWD_T80_UZK500.txt"; "T80_UZK700.txt"]
how can I get numbers after "T" and after "UZK"?
I need a rule that will describe only the numbers after the designated patterns.

  2 Comments

Adam Danz
Adam Danz on 10 May 2019
Are "T" and "UZK" the only possible letters in the names?
Eduard Mazur
Eduard Mazur on 10 May 2019
It's variable symbols which are defined earlier.
I mean, I have filenames (string) and patterns (variable inside this names). With this information I need extract numerical vallues after variables..

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Accepted Answer

Stephen Cobeldick
Stephen Cobeldick on 10 May 2019
Edited: Stephen Cobeldick on 10 May 2019
Matching only integer numbers after 'UZK' or 'T_' (it is unclear in your question if the underscore is permitted or not, but the regular expression below is easy to adapt):
>> S = {'T_24_UZK500.txt';'FWD_T80_UZK500.txt';'T80_UZK700.txt'};
>> C = regexp(S,'(?<=(T_?|UZK))\d+','match');
>> C{:}
ans =
'24' '500'
ans =
'80' '500'
ans =
'80' '700'
Or simply by matching any integer numbers:
>> C = regexp(S,'\d+','match');
>> C{:}
ans =
'24' '500'
ans =
'80' '500'
ans =
'80' '700'

  4 Comments

Show 1 older comment
Adam Danz
Adam Danz on 10 May 2019
Small change from Stephen's solution: here you can list the potential patterns and the expression will be created according to your list. Also, underscores are removed ahead of time.
S = {'T_24_UZK500.txt';'FWD_T80_UZK500.txt';'T80_UZK700.txt'};
patterns = {'T', 'UZK'};
exp = ['(?<=(', strjoin(patterns,'|') ,'))\d+'];
% Remove all underscores (if any)
S = strrep(S, '_', '');
C = regexp(S, exp, 'match'); % use regexpi() to ignore case
Eduard Mazur
Eduard Mazur on 10 May 2019
Thanks for your helping!
This solution fit for me.
madhan ravi
madhan ravi on 10 May 2019
Using exp as a variable name is not a good idea it would thwart the inbuilt function exp()

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