Combining multiple regexs in a sed statement

I would like to discover the version number of docker-compose. The format differs per version.

Ex: Running docker-compose –version

docker-compose version 1.29.2, build someId
Docker Compose version v2.12.2

I have separate sed statements that grab the version number, but if possible I’d like to combine them.

echo `docker-compose --version` | sed -nr 's|^docker-compose version (.*)(,.*)|\1|p'
echo `docker-compose --version` | sed -nr 's|^Docker compose version v(.*)|\1|p'

If I or the two regexes together using a pipe, the reference needs to change to either \1 or \3 depending where it’s caught.

Is there a better way using sed?

>Solution :

You can merge the two expressions into

echo `docker-compose --version` | sed -nr 's|^[dD]ocker[ -][cC]ompose version v?([^, ]*).*|\1|p'

Details:

• ^ – start of string
• [dD] – d or D
• ocker – a literal string
• [ -] – a space or hyphen
• [cC] – c or C
• ompose version – a fixed string
• v? – an optional v char
• ([^, ]*) – Group 1: zero or more chars other than space and comma
• .* – the rest of the string.