What's new about regular epression literals from ECMAScript 5 to ECMAScript3

说明|评论

function make_a_matcher( ) { 
	return /a/gi; 
} 
var x = make_a_matcher( ); 
var y = make_a_matcher( ); 
// Beware: x and y are the same object! 
x.lastIndex = 10; 
document.writeln(y.lastIndex); // 10 in ECMAScript 3(FF3.6), & 0 in ECMAScript 5(IE6-9,FF4.0,Chrome,Sfari)

var my_regexp = /([8/5+4]*).{3}/g;
var str = '8/5+4 is what!';

var result = my_regexp.exec(str); // the same in IE6-9,FF3.6-4.0,Chrome,Safari

for(var i = 0,n = result.length; i < n; ++i){
  document.writeln(result[i]);  
}