brackets.js

/**
 * Implement function verify (text) which checks whether brackets within text are correctly nested.
 * You need to consider brackets of three kinds: (), [], <>.
 */
 
 (function() {
	function verify(value){
		var str = '';
		value = value.replace(/[^\(\)\[\]\<\>]/g,'');

		while(value.length != str.length) {
			str = value;
			value = value.replace('()','').replace('[]','').replace('<>','');
		}
		return !value.length;
	}

console.log(verify("---(++++)----")); //true
console.log(verify("")); //true
console.log(verify("before ( middle []) after")); //true
console.log(verify(")(")); //false
console.log(verify("}{")); //true
console.log(verify("<( >)")); //false
console.log(verify("( [ <> () ] <> )"));

})();