how to read text files using regular expressions
8 views (last 30 days)
Show older comments
Li Xue
on 12 Jul 2017
Answered: Walter Roberson
on 12 Jul 2017
What is a fast way to read lines that matches some regular expressions from a text file? For example, read only the lines starting with integer, and split this line by spaces into a vector. I would like to use textscan, because it is very fast.
An example file looks like this:
0 Comments
Accepted Answer
Walter Roberson
on 12 Jul 2017
textscan is not able process regular expressions.
You can read the entire file in at one time using fileread, into a string. You can use regexp or regexprep to select portions of the string, for which you will probably need to use the options 'lineanchors' and 'dotexceptnewline'. You can then enter break the remaining up using text processing or you can pass the resulting string as the first parameter to textscan replacing the fid parameter.
0 Comments
More Answers (0)
See Also
Categories
Find more on Large Files and Big Data in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!