Extracting a number from certain line of .txt file

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Mohammad Mirza Hassan
评论： Mohammad Mirza Hassan 2018-6-19
Hi everyone I have big .txt file and I want to extract the certain value
How can I extract and print the value written after "COLLAPSE MULTIPLIER=" into file.

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Paolo
Paolo 2018-6-19
For the values which follow "COLLAPSE MULTIPLIER = ", you can simply use a positive lookbehind which checks for the pattern you indicated.
file = fileread('collapsemultiplier.txt');
match = regexp(file,'(?<=COLLAPSE\sMULTIPLIER\s=\s)(\d*.?\d*)','match');
match =
1×10 cell array
Columns 1 through 6
{'1.945'} {'3.594'} {'4.648'} {'5.361'} {'5.898'} {'6.360'}
Columns 7 through 10
{'6.727'} {'7.038'} {'7.337'} {'7.584'}
You can play around with it here.
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