Grep specific data from a string

Question

Here is the data:

Valid from: Fri Nov 24 12:11:28 EST 2017 until: Sun Nov 24 12:11:28 EST 2019
Valid from: Fri Feb 24 13:21:19 EST 2017 until: Thu Feb 24 13:31:19 EST 2022
Valid from: Tue Dec 20 12:01:19 EST 2016 until: Fri Dec 20 12:11:17 EST 2041

I want to extract only data which is written after 'until:' word.

For example I should get only Sun Nov 24 12:11:28 EST 2019.

Does the solution require `grep`, or are you just suggesting that `grep` might be a solution to your *real question*, which is "[how do I] return specific data from [a] string?" — Christopher Schultz, Aug 20 '18 at 13:55
The title references "Grep" but there's no reason why the grep command should be involved in this at all, the way it's presented. @GAD3R is correct; this is a dupe. It has nothing to do with returning specific lines and everything to do with throwing away everything before a specific pattern of characters, which the other question already answers perfectly. — Monty Harder, Aug 20 '18 at 15:39
you want only the first line or the text after until on each lines? Because you said: `I should get only Sun Nov 24 12:11:28 EST 2019.` It's not clear if it's only the 1st line example or the result of the whole. — рüффп, May 16 '19 at 22:12

score 8 · Answer 1 · answered Aug 20 '18 at 08:38

8

Try also

awk '{sub (/^.*until: /, "")} 1' file
Sun Nov 24 12:11:28 EST 2019
Thu Feb 24 13:31:19 EST 2022
Fri Dec 20 12:11:17 EST 2041

or even shorter

sed 's/^.*until: //' file
Sun Nov 24 12:11:28 EST 2019
Thu Feb 24 13:31:19 EST 2022
Fri Dec 20 12:11:17 EST 2041

answered Aug 20 '18 at 08:38

RudiC

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can also use "until: " as the field separator and print the 2nd field: `awk -F 'until: ' '{print $2}'` – glenn jackman Aug 20 '18 at 14:48

score 6 · Answer 2 · answered Aug 20 '18 at 14:47

6

With GNU grep

echo "$string" | grep -oP 'until: \K.*'

That matches the word "until: ", then the \K forgets about everything that was just matched, then the .* can match everything after that.

answered Aug 20 '18 at 14:47

glenn jackman

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Thanks, did not know about `\K`. Until now I always used lookbehinds, but this saves three characters ;-) – pLumo Aug 20 '18 at 14:55
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one of the drawbacks of lookbehinds is that the patterns have to have a fixed width. That restriction does not apply with `\K` – glenn jackman Aug 20 '18 at 15:04

score 3 · Answer 3 · answered Aug 20 '18 at 09:27

By setting the awk delimiter to "until:" you can get the subsequent string while this text exist on your string. awk -F'until:' '{print $2}'

echo "Valid from: Fri Nov 24 12:11:28 EST 2017 until: Sun Nov 24 12:11:28 EST 2019" | awk -F'until:' '{print $2}'

score 2 · Answer 4 · edited Aug 20 '18 at 08:37

2

grep -o 'until: [^V]*' file | cut -d ':' -f 2-

edited Aug 20 '18 at 08:37

RedGrittyBrick

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answered Aug 20 '18 at 08:15

Alexander

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why `[^V]` and not just `.` ? – pLumo Aug 20 '18 at 14:57
first sample wasn't split for lines, So I was grepping until next 'V' in 'Valid' word. I Agree, That now it loooks weered . – Alexander Aug 20 '18 at 15:01

score 2 · Answer 5 · answered Aug 20 '18 at 09:05

2

If format will always be the same you can also try :

cut -d':' -f 5- /path-to-file

answered Aug 20 '18 at 09:05

Constantine Babuadze

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Grep specific data from a string

5 Answers5