Find a substring inside a bash variable

Question

we tried to find the username of the mercury URL:

default = ssh://[e-mail]//srv/hg/repo

Suppose there is always a username, I came up with:

tmp=${a#*//}
user=${tmp%%@*}

Is there a way to do this on a single line?

Answer 1

Assuming your string has a variable like this:

url='default = ssh://[e-mail]//srv/hg/repo'

You can do:

[[ $url =~ //([^@]*)@ ]]

Then your username is here:

echo ${BASH_REMATCH[1]}

This works in Bash versions 3.2 and higher.

Answer 2

To a large extent, you need more than one application or access external tools. I think sed is best suited for this.

sed -r -e 's|.*://(.*)@.*|\1|' <<< "$default"

Answer 3

bash. , sed.

Answer 4

mercurial, url,

echo 'ssh://[e-mail]/srv/hg/repo' |grep -E --only-matching '\w+@' |cut --delimiter=\@ -f 1

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