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How to replace a string at specific line number in a text file?

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%%.text file contain%%%
In this
part a
method for
to fixed‐point
%%%new .text file contain%%
In this
part a
method for
/////newly added string///
to fixed‐point
how to replace the string at specific line number?
Rik on 31 Jan 2020
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Answers (1)

Andrew Janke
Andrew Janke on 31 Jan 2020
Try this:
  • Read in the whole text file
  • Split it on \r?\n to break it in to lines
  • Now you have an array of lines, so you can edit line(i) to modify just the i-th line
  • Use strrep or regexprep to modify the contents of that line
  • Use strjoin() to join all the lines back together into a single string
  • Write that string out to your new file


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