CODEWITHSUNDEEP
regexgrep
Abhishek Thakur
Abhishek Thakur

Reputation: 17025

grep regular expression returns full line

Im trying to print everything after a keyword using grep but the command returns the whole line. Im using the following:

grep -P (\skeyword\s)(.*)

an example line is:

abcdefg         keyword   hello, how are you.

The result should be hello, how are you but instead it gives the full line. Am I doing something wrong here?

Upvotes: 2

Views: 181

Answers (2)

Avinash Raj
Avinash Raj

Reputation: 174756

You need to use -o (only matching) parameter and \K (discards the previously matched characters) or a positive lookbehind.

grep -oP '\skeyword\s+\K.*' file

\K keeps the text matched so far out of the overall regex match. \s+ matches one or more space characters.

Example:

$ echo 'abcdefg         keyword   hello, how are you.' | grep -oP '\skeyword\s+\K.*'
hello, how are you.

Upvotes: 6

David Hoelzer
David Hoelzer

Reputation: 16361

By default, Grep prints lines that match. To print only matching expressions try the '-o' option.

Upvotes: 2

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