使用带有sed的正则表达式用下划线替换空格

Question

I need to replace all the matches of the following PCRE by underscores in a file with sed.

/(?:^Node-path: |\G)\S+\K\h+/gm

I have tried escaping parenthesis, remove espacing of G, S, K... but still can't get it to work.

Anyone can help plase?

Answer 1

If your sed is gnu sed, you can mix NUMBER and g modifier in order to skip the first space:

sed '/^Node-path:/s/ /_/2g'

If your sed is not gnu sed, the NUMBER+g may not be supported. However you can do this trick:

sed '/^Node-path:/{s/ /_/g;s/_/ /}'

or

sed '/^Node-path:/{s/ /_/g;s/:_/: /}'