How to match a range of string that doesn't contain an specific word using only regular expression?

Question

I have a string like this.

var str = "[cat dog] [dog cow] [cow cat] [cat tiger] [tiger lion] [monkey dog]";

I want to match the pair of animals that doesn't contain a specific one. For example I want to select all pair of animals that doesn't contain dog. So the output should be

[cow cat]
[cat tiger]
[tiger lion]

Is it possible to match using Regular Expression using str.match() method?

Dupe of https://stackoverflow.com/questions/37240408/regular-expressions-ensuring-b-doesnt-come-between-a-and-c — CertainPerformance, Mar 24 '19 at 03:15
No, it's the same, just match `[`, lazy-anything which doesn't contain `dog` (using linked method), then match `]` — CertainPerformance, Mar 24 '19 at 03:35

Jack Bashford · Accepted Answer · 2019-03-24T03:35:44.047

This seems to work:

var regex = /\[(?!dog)([a-z]+) (?!dog)([a-z]+)\]/gi;
var string = "[cat dog] [dog cow] [cow cat] [cat tiger] [tiger lion] [monkey dog]";
console.log(string.match(regex));

The above regex matches only two animals in each pair of brackets - this one matches one or more:

var regex = /\[((?!dog)([a-z]+) ?){2,}\]/gi;
var string = "[cat dog] [dog cow] [cow cat] [cat tiger] [tiger lion] [monkey dog] [one animal two animal three animal]";
console.log(string.match(regex));

How to match a range of string that doesn't contain an specific word using only regular expression?

1 Answers1