Regex lazy on non-capturing group

Question

I have this regex:

(?:(?:AND\sNOT|AND|OR)(?!.*(?:AND\sNOT|AND|OR))\s)(.*)

What I want is to get the last key:value pair, example -

k:v AND k1:v1 AND NOT k2:v2 OR k3:v3

I want the regex to match k3:v3, and it does, but it doesn't match the key:value in the next situation -

k:v

I need it to match the key:value pair even if it's the first one and there's no operators brefore...

update: key:value is not the issue here, I need it to match everything after the last operator

update 2: tried to do the following -

(?:(?:AND\sNOT|AND|OR)?(?!.*(?:AND\sNOT|AND|OR))\s)(.*)
(?:(?:AND\sNOT|AND|OR?)(?!.*(?:AND\sNOT|AND|OR))\s)(.*)

didn't work

Maybe (?:.*(?:AND\sNOT|AND|OR)\s)?(.*)$

Srdjan M.
– Srdjan M.

2018-02-25 13:01:46 +00:00
Commented Feb 25, 2018 at 13:01 — Srdjan M.
– Srdjan M., Commented Feb 25, 2018 at 13:01
Can you post your comment as an answer so I could vote it?

Nadav Shabtai
– Nadav Shabtai

2018-02-25 14:11:51 +00:00
Commented Feb 25, 2018 at 14:11 — Nadav Shabtai
– Nadav Shabtai, Commented Feb 25, 2018 at 14:11
Added and updated regex!

Srdjan M.
– Srdjan M.

2018-02-25 14:40:07 +00:00
Commented Feb 25, 2018 at 14:40 — Srdjan M.
– Srdjan M., Commented Feb 25, 2018 at 14:40

Jeto · Accepted Answer · 2018-02-25 15:08:40Z

2

Edit - My bad, \K isn't supported in JS. Here's an alternative one:

/(?:.*(?:AND|OR|NOT)\s+)?(.*)/ (group 1)

https://regex101.com/r/AyVV89/3 (Please check the matches on the right panel, for some reason group 1 isn't highlighted on the text.)

Original post

Per your last update (that wasn't obvious at all before you mentioned it):

key:value is not the issue here, I need it to match everything after the last operator

This one will match anything after the last operator, no matter what it is (and work without an operator too):

/(?:.*(?:AND|OR|NOT)\s+\K)?.*/

https://regex101.com/r/AyVV89/2

edited Feb 25, 2018 at 15:08

answered Feb 25, 2018 at 14:59

Jeto

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2 Comments

revo Over a year ago

Javascript doesn't support \K.

Jeto Over a year ago

You're right, didn't realize that. Will edit/delete my answer then, thanks.

revo · Accepted Answer · 2018-02-25 15:05:11Z

1

Update

As per comments, I assume you need to match last key:value pair along with its operator if any, and anything that comes after:

(?:.*\b(AND(?:\sNOT)?|OR) +)?(\S+:\S+.*)

Live demo

What you need could be simplified into this:

(?:AND(?:\sNOT)?|OR)\s+(\S+)$

Live demo

(?:AND(?:\sNOT)?|OR) match AND or AND NOT or OR
\s+ match any number of whitespaces
(\S+) match and capture none-whitespace characters
$ asserts end of string

edited Feb 25, 2018 at 15:05

answered Feb 25, 2018 at 13:31

revo

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6 Comments

Nadav Shabtai Over a year ago

Your regex is not working as expected: regex101.com/r/JXXjWk/2

revo Over a year ago

Well are you seeking for \S+$? Look at this demo.

Nadav Shabtai Over a year ago

No, your regex is not including white spaces event if it's not operator between them.. look at my question again.. anyway S.Jovan posted the correct regex

Nadav Shabtai Over a year ago

regex101.com/r/yniN74/2 it matches the last word, not everything after the operator... I need the operators to be the separator, not white spaces

revo Over a year ago

So you need everything after last key:value pair? here asd asd?

|

AndreyS Scherbakov · Accepted Answer · 2018-02-25 13:33:50Z

0

From your explanation, you don't need the first operator at all. Simply try

(?!.*(?:NOT|AND|OR)\s)(\b.*)

edited Feb 25, 2018 at 13:33

answered Feb 25, 2018 at 13:07

AndreyS Scherbakov

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1 Comment

Nadav Shabtai Over a year ago

your regex is not valid

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