find numbers in a string

2023 7 25
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更新时间：2023 7 25
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Hi,
I have the following example of string 'E_Field (Farfield) (Cartesian) (-0 -1000 -1)(Abs) (cosim Tran1).txt' .
I need to extract the numbers between the brackets 0,1000,-1.
I have tried using the regexp function but without any success.
I will appriciate any kind of assistance.

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回答（1 个）

Chunru
Chunru 2023-7-25
编辑：Chunru 2023-7-25
Ran in:

0 个投票

Ran in:
s = 'E_Field (Farfield) (Cartesian) (-0 -173.648 983.808)(Abs) (cosim Tran1).txt';
s1 = 'E_Field (Farfield) (Cartesian) (-0 -1000 -1)(Abs) (cosim Tran1).txt' ;
p = '(\(-?\d+ -?\d+(.\d*)? -?\d+(.\d*)?\))';
t=regexp(s, p, 'tokens');
t = t{1}{1}
t = '(-0 -173.648 983.808)'
n = sscanf(t, '(%f %f %f)')
n = 3×1
0 -173.6480 983.8080
t1=regexp(s1, p, 'tokens');
t1 = t1{1}{1}
t1 = '(-0 -1000 -1)'
n1 = sscanf(t1, '(%f %f %f)')
n1 = 3×1
0 -1000 -1

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EYAL COHEN
EYAL COHEN 2023-7-25
Chunru Hello,
I thank you for your answer but I would like to add that (1) I need all three numbers inbetween the brackets (2) the string changes. For example, it can be as follows 'E_Field (Farfield) (Cartesian) (-0 -173.648 983.808)(Abs) (cosim Tran1).txt'
Chunru
Chunru 2023-7-25
See the updated.
EYAL COHEN
EYAL COHEN 2023-7-25
It seems to isolate the numbers in the brackets for the second example but fails to the first. The numbers are required to be converted to an array of double.
Chunru
Chunru 2023-7-25
See above
EYAL COHEN
EYAL COHEN 2023-7-25
移动：Bruno Luong 2023-7-25
It seems to work, I thank you for your help. A big help.

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