使用sed替换文件中的字符串

Question

I have file with data fields in this format YYYY-MM-DD HH:MM:SS but I noticed the export set the Months values to be the same as the minutes value. I want to use sed to replace the Month value for all line to the same value.

I am trying this and it didn't work:

sed "s/-[0-9]{2,}-/-08-/g" test.txt

Anyone have an idea how to do this?

Answer 1

$ sed 's/^\(....\)-../\1-09/' < input

Input:

$ cat input 
2012-52-05 09:52:00
2012-53-05 09:53:00
2012-54-05 09:54:00

Output:

$ sed 's/^\(....\)-../\1-09/' < input
2012-09-05 09:52:00
2012-09-05 09:53:00
2012-09-05 09:54:00

Answer 2

使用GNU sed：

sed -r 's/([0-9]{4})-[0-9]{2}-/\1-08-/' infile