var str="abba baab green glass roof";
var reg=/(.)(.)\2\1/g
console.log( str.match(reg))
Ответ:
[ 'abba', 'baab' ]
JavaScript test | #JavaScript
JA JavaScript test @js_test · 9.67K subscribers var str="abba baab green glass roof";
var reg=/(.)(.)\2\1/g
console.log( str.match(reg))