Log Parsing using MATLAB

Hello! Can someone help me with log parsing a file? I did searched videos and I get some parts of it like importing.

For example this is my file (data_file.txt)

98.140.180.244 - harber4797 [21/Jun/2019:16:01:53 -0700] "POST /seize/b2b/synergistic HTTP/2.0" 203 9396
54.92.231.149 - ziemann5634 [21/Jun/2019:16:01:54 -0700] "GET /revolutionize/matrix HTTP/2.0" 304 27968
205.98.120.209 - trantow6874 [21/Jun/2019:16:01:39 -0700] "PUT /front-end/world-class/partnerships/schemas HTTP/1.0" 401 25144
148.196.48.243 - ondricka6863 [21/Jun/2019:16:01:40 -0700] "GET /best-of-breed/reinvent HTTP/1.1" 501 29641
130.229.174.187 - hackett3055 [21/Jun/2019:16:01:41 -0700] "GET /sticky/deliver HTTP/2.0" 404 5708

if I input 'harber4797' to a function, how can I extract its whole line? What conditional works should I do? Thank you

Answer 1

[Walter Roberson]

S = fileread('data_file.txt');

line_matches = regexp(S, '^.*\sharber4797\s.*$', 'lineanchors', 'dotexceptnewline')

[Ruben Ruiloba]

Many thanks.

Answer 2

[Ruben Ruiloba]

I get an error Matrix dimensions must agree. when I run

line_matches = regexp(S< '^.*\sharber4797\s.*$', 'lineanchors', 'dotexceptnewline')

Not sure why.

[Walter Roberson]

Sorry about that. < is shift-comma on my keyboard, and I wanted a comma at that point instead of a <