How to use grep to get anything just after `name=`?

Question

I’m stuck in trying to grep anything just after name=, include only spaces and alphanumeric.

e.g.:

name=some value here

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Answer 1

Try this:

sed -n 's/^name=//p' filename

It tells sed to print nothing (-n) by default, substitute your prefix with nothing, and print if the substitution occurs.

Bonus: if you really need it to only match entries with only spaces and alphanumerics, you can do that too:

sed -n 's/^name=\([ 0-9a-zA-Z]*$\)/\1/p' filename

Here we've added a pattern to match spaces and alphanumerics only until the end of the line ($), and if we match we substitute the group in parentheses and print.