find numbers in a string

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.

Answer 1

[Chunru]

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

[EYAL COHEN]

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]

See the updated.

[EYAL COHEN]

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]

See above

[EYAL COHEN]

It seems to work, I thank you for your help. A big help.