text = fileread('example.txt');
% extract data
match = regexpi(text, '(?<key>(Elsasser\s*Number)|(Lorentz\s*Number)|(Power\s*(\([^\)]+\))?))\s*=\s*(?<val>(\s*\d+(\.\d+)?)+)', 'names')
match =
1×3 struct array with fields:
key
val
% display struct content to command window
struct2table(match, 'AsArray', true)
ans =
3×2 table
key val
______________________ __________________________
'Elsasser Number' '0.309188 0.309188'
'Lorentz Number' '0.001758'
'Power (eq 21 of C&A)' '20299.521762'
I used a regular expression to extract the data into a struct array containing a key-value pair
It's worth mentioning that this regexp works for the supplied file, but may break for other examples
regular expressions are very useful for such tasks, and to better understand, I suggest you search in google for a regular expression builder. most of them are good enough. some have very good teaching modules which help you learn how to write expressions
