用sed替换文件中的特定模式或替换

Question

In my sitemap file i want to replace :(colon) with _ (underscore). But I don't want to replace other : in file such as timestamp.

my line

    <sitemap><loc>http://www.example.com/sitemap_2014-09-27_09:42:43_1.xml.gz</loc>
<lastmod>2014-09-27 09:42:43</lastmod></sitemap>

In this line "sitemap_2014-09-27_09:42:43_1.xml.gz" should become "sitemap_2014-09-27_09_42_43_1.xml.gz" but timestamp in should not affect.

I am new to sed and patterns. Can someone provide sed or replace or any other linux command to replace this pattern in a file.

Answer 1

You could try this GNU sed command,

sed -r 's/([^ ])([0-9]{2}):([0-9]{2}):([0-9]{2})/\1\2_\3_\4/g' file

Through basic sed,

sed 's/\([^ ]\)\([0-9]\{2\}\):\([0-9]\{2\}\):\([0-9]\{2\}\)/\1\2_\3_\4/g' file