in reply to Re^2: how to modify the text in file
in thread ho w to replace a occurence of string by other string
That is a shell quoting problem. Your $1 gets replaced by an (empty) environment variable before Perl sees it. Use single quotes:perl -npi.bak -e "s:(\w\d+\.data):testname/$1:g" file1.txt
perl -npi.bak -e 's:(\w\d+\.data):testname/$1:g' file1.txt
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