如何在MATLAB中按$分割.txt文件内容并实现换行？

Hey there! Let's work through this MATLAB text formatting problem together. You want to take a text file with $ separators, split the content at each $, and format it with line breaks (plus replace $ with spaces based on your example output). Here are a few simple, effective approaches:

Method 1: Quick Replace & Write (Great for Simple Cases) #

If you just need to swap every $ for a space followed by a line break (or just a line break), this one-liner-style approach works perfectly:

% Read the entire content of your input file in one go
input_content = fileread('your_input_file.txt');

% Replace each '$' with a space + newline (change to '\n' if you don't want the space)
processed_content = strrep(input_content, '$', ' \n');

% Write the cleaned content to a new output file
fid = fopen('formatted_output.txt', 'w');
fprintf(fid, '%s', processed_content);
fclose(fid);

For your sample input hello$world good$morning thank$you$everybody, this will produce:

hello 
world good 
morning thank 
you 
everybody

Method 2: Phrase-by-Phrase Formatting (Matches Your Example) #

Your desired output shows full phrases like hello world on separate lines. This approach splits the original text by spaces first, cleans up the $ in each phrase, then writes each phrase to its own line:

% Grab all text from the input file
input_text = fileread('your_input_file.txt');

% Split the text into individual phrases using spaces as the separator
phrases = split(input_text, ' ');

% Replace every '$' with a space in each phrase
cleaned_phrases = strrep(phrases, '$', ' ');

% Write each cleaned phrase to the output file, one per line
fid = fopen('final_output.txt', 'w');
for idx = 1:length(cleaned_phrases)
    fprintf(fid, '%s\n', cleaned_phrases{idx});
end
fclose(fid);

This will give you exactly the output you showed:

hello world
good morning
thank you everybody

Bonus: Line-by-Line Processing (For Large Files) #

You mentioned thinking about fgetl and ischar—if you're working with a huge file that can't fit in memory, reading line by line is the way to go. Here's how to use those functions:

% Open your input and output files
input_fid = fopen('your_input_file.txt', 'r');
output_fid = fopen('line_by_line_output.txt', 'w');

% Read lines one at a time until we hit the end of the file
current_line = fgetl(input_fid);
while ischar(current_line)  % ischar checks if we're still reading valid text (not EOF)
    % Replace '$' with space + newline (adjust as needed)
    processed_line = strrep(current_line, '$', ' \n');
    fprintf(output_fid, '%s\n', processed_line);
    current_line = fgetl(input_fid);
end

% Don't forget to close both files!
fclose(input_fid);
fclose(output_fid);

ischar here just helps us confirm that fgetl returned a valid line of text (instead of -1, which means we've reached the end of the file).

内容的提问来源于stack exchange，提问作者T.Ghosh