I have a file test123.txt which contains one instance of a string like clover-12345678.tmp, where the prefix is always clover-, the suffix is always .tmp, but the number in between can be any 8 digit number.

I wish to substitute this string in the file with a different string, butterfly.

The regex for the string I wish to substitute is clover-\d\d\d\d\d\d\d\d\.tmp.

My sed command for the substitution is:

sed -i -e "s/clover-\d\d\d\d\d\d\d\d\.tmp/butterfly/g" test123.txt

However, this does not change anything in the test123.txt file, even though it contains one instance of clover-12345678.tmp.

How can I fix this?

CodePudding user response：

How can I fix this?

\d is just character d. Replace \d with [0-9]. You can also [0-9]\{8\}{