Reading only those lines starting with a specific string

Hello, I have a text file. Now I want to read only those line which start with particular strings only. For example, I have sentences in text file as...

1_xyz_sdf_rtuy_errt

2_dsgs_sdfs_sfs_ewtw

3_sd_sddgs_ewetertert

4_....

etc

(The numbers from starting of each line will go on increasing) where you can see each line starts with a string 1 or 2 or 3 etc, so I have to check whether particular line starts with 1 if YES the find 'xyz' string from the line. similarily if line starts with 2 then find another 'xyz' string so on and so forth... Can anyone please help me?

Thank you

Answer 1

[Ameer Hamza]

It might be a better solution to read the entire file into memory using textscan() and then search for a particular line or string.

If you just want to search the file once or still want to incrementally search the file, then just use fgetl(), to read lines one by one from the text file and search until you reach required line.