I thought I was pretty good at regex, but I could never have written this one and had to consult both `man grep` and regex101.com.
Explanations for the beginner and intermediate regex and grep user:
`-o`: Only return the match, instead of the entire line
`-P`: use Perl compatible regex
`-m` max-count, Stop reading a file after NUM matching lines.
And now for the regex:
`name:`: find the exact match
`\s*"`: Zero or more spaces leading up to and including an double quote
`\K`: This was the kicker for me. "resets the starting point of the reported match. Any previously consumed characters are no longer included in the final match" - basically tells the regex engine that the characters _before_ `\K` needs to be there in order to form a match, but it should only return the characters _after_ `\K` as the match. This is super handy! Is there a "reverse \K"?
`[^"]+`: One or more characters that are not a double quote. This basically means "Find the line that has a key called "name" and return all the characters after the first double quote and until the last double quote"
Explanations for the beginner and intermediate regex and grep user:
`-o`: Only return the match, instead of the entire line
`-P`: use Perl compatible regex
`-m` max-count, Stop reading a file after NUM matching lines.
And now for the regex:
`name:`: find the exact match
`\s*"`: Zero or more spaces leading up to and including an double quote
`\K`: This was the kicker for me. "resets the starting point of the reported match. Any previously consumed characters are no longer included in the final match" - basically tells the regex engine that the characters _before_ `\K` needs to be there in order to form a match, but it should only return the characters _after_ `\K` as the match. This is super handy! Is there a "reverse \K"?
`[^"]+`: One or more characters that are not a double quote. This basically means "Find the line that has a key called "name" and return all the characters after the first double quote and until the last double quote"