How to extract and capture particular multiple words using or option in REGEX.?

Question

I have small query and requirement regarding REGEX.

I have set of files in one location in that i want to capture only some files that are important:

The INPUT is:

```
-rw-r----- 1 osm_user osm_user 51200310 Dec  2 15:55 osm_ms01.log00025
-rw-r----- 1 osm_user osm_user 51200201 Dec  2 19:52 osm_ms01.log00026
-rw-r----- 1 osm_user osm_user 51200010 Dec  2 23:49 osm_ms01.log00027
-rw-r----- 1 osm_user osm_user  1251657 Dec  3 02:53 osm_ms01.out00098
-rw-r----- 1 osm_user osm_user    14534 Dec  3 03:23 osm_ms01.out00099
-rw-r----- 1 osm_user osm_user  2124021 Dec  9 00:42 access.log
-rw-r----- 1 osm_user osm_user  3406259 Dec  9 00:44 osm_ms01.out00100
-rw-r----- 1 osm_user osm_user    14632 Dec  9 00:55 osm_ms01.out00101
-rw-r----- 1 osm_user osm_user  4142712 Dec  9 01:00 osm_ms01-diagnostic.log
-rw-r----- 1 osm_user osm_user 51200768 Dec  9 13:20 osm_ms01.log00028
drwxr----- 2 osm_user osm_user     4096 Dec 11 00:58 metrics
-rw-r----- 1 osm_user osm_user  1101990 Dec 11 01:38 osm_ms01.out
-rw-r----- 1 osm_user osm_user  1150229 Dec 11 01:38 osm_ms01.log
```

In above input i just want to capture these below files:

```
access.log
osm_ms01-diagnostic.log
osm_ms01.log
```

I tried this below REGEX but i cant find any solution.

The regex is used

1) .*\.log.* 2) (access.log|osm_ms01.log|osm_ms01-diagnostic.log)

In second regex i can captured information but its capturing information that not necessary.

Please help me on this.

score 1 · Answer 1 · edited Dec 11 '15 at 14:03

1

use

(access.log|osm_ms01.log|osm_ms01-diagnostic.log)$

for matching from the ending

edited Dec 11 '15 at 14:03

Andrei

42,814
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answered Dec 11 '15 at 12:49

nkit

156
4

Thanks One small doubt the one you given also working and @naurel given one regex with boundary that also matching. What diffrence between $ and /b. which one is efficient to use. ? – Teja R Dec 12 '15 at 17:58
/b is for matching word breaks, while $ is to match line end – nkit Dec 14 '15 at 05:31

score 0 · Answer 2 · edited May 23 '17 at 12:31

0

I feel this is similar to this page

If you put each line into an array element, and check if the the string if it contains what you want.

edited May 23 '17 at 12:31

Community

1
1

answered Dec 11 '15 at 10:38

Tomaltach

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1
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30

naurel · Answer 3 · 2015-12-11T11:08:25.567

0

You need to check that your .log isn't followed by another char. To do so you can check for the word boundary before and after :

\b(access.log|osm_ms01.log|osm_ms01-diagnostic.log)\b

Demo

All credit goes to @stribizhev

edited Dec 11 '15 at 11:08

answered Dec 11 '15 at 10:51

naurel

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2

Perhaps, `(?<=\s)` and `(?=\s)` can be replaced with a mere `\b`. Something like `\b(access\.log|osm_ms01\.log|osm_ms01-diagnostic\.log)\b` – Wiktor Stribiżew Dec 11 '15 at 10:56

How to extract and capture particular multiple words using or option in REGEX.?

3 Answers3