How can I select a specific line in a text file base on a specific string in that line?

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Jestoni Orcejola
Jestoni Orcejola 2020-7-18
评论： Image Analyst 2020-7-19
I am trying to extract rows from a .txt file that start with a specific string. For example in the attached .txt file, I would like to only extract the values from the lines with 'CR5' into a table. My end goal here is to be able to plot the values.
Thanks.

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Rik
Rik 2020-7-18
编辑：Rik 2020-7-18
Read the entire file and split by newline character (e.g. with my readfile function). Then you can parse line by line in a loop, or use functions like contains.
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Jestoni Orcejola
Jestoni Orcejola 2020-7-19
It is a string array and I would like like to convert it to a numeric array. Using str2double results in an error. The goal is to extract the last value in the row for plotting porpuses.

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