Javascript-REGEX

Question

I am trying to create a Regex to match patterns existing in multiple lines. The code is as follows:

(.*Action name.*\n.*Action status.*)[\n+]*(good)

The text string is as follows:

Workflow name:icl_prd_db_logs
Action name:backup
Action status:failed
hi
how r u
good
perfect
Code successfully completed
Another code failed

Now I can use one \n if I want to match Action name and Action status because those are sequential lines. But, if I want to match a line which exists after several lines then a single \n will not work. In other words, how can I use \n multiple times something like [\n]+ or [\n]*+ or [\n+](.*).

I don't want to use any arrays just I need a single line code which can map all the existing pattern matches. Does anyone know how to do that?

In the above-mentioned code, I am trying to search good pattern which is two lines away from the Action status line so I have tried to use [\n+]* but it doesn't work at all. Can anyone help me to sort out this code?

There are a lot of questions on SO that presume that regular expressions can do more than they can. When someone wants a magic catch-all regular expression that can be very complicated and even more difficult to maintain. Whereas a solution that involves several lines of code or a few regular expressions can be more easily understood and more easily maintained. Is there a reason why "I need a single line code"? — phuzi
– phuzi, Commented Feb 1, 2018 at 8:59
Of course looking for multiple consecutive line breaks doesn’t work, because you don’t have any of those here. Those lines all contain characters before the line break. — C3roe
– C3roe, Commented Feb 1, 2018 at 9:00

pathik devani · Accepted Answer · 2018-02-01 09:02:40Z

2

You can write (.*\n.*)* for multipal line regex. So finally your regex is (.*Action name.*(\n)+.*Action status.*)(.*\n.*)*(good).

https://regex101.com/r/yGpz5v/1

answered Feb 1, 2018 at 9:02

pathik devani

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1 Comment

karthik Over a year ago

Thanks for the quick support Pathik. I have succesfully tested this pattern match condition in my environment. I am facing one more issue for large amounts of data in log file and due to that there is an error called 'Catastrophic backtracking' issue.

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