RegExp.prototype.exec()
JavaScript RegExp.prototype.exec()方法
exec()方法返回包含所有匹配组的数组。它执行对指定字符串中的匹配项的搜索。如果找到匹配项，则返回一个数组。否则，它返回null。
语法
RegExpObject.exec( string )
参数
string：要搜索的字符串。
返回值
如果找到匹配项，它将返回数组。否则，它将返回null。
示例1
var str = "Javascript is an interesting scripting language";
var re = new RegExp( "script", "g" );
var result = re.exec(str);
document.writeln("Test 1 - returned value : " + result);
输出：
Test 1 - returned value：script
示例2
var str = "Javascript is an interesting scripting language";
var obj = new RegExp( "output", "g" );
var res = obj.exec(str);
document.writeln("<br />Test 2 - returned value : " + res);
输出：
Test 2 - returned value：null
示例3
var string = "Javascript is an interesting scripting language";
var obj1 = new RegExp( "script", "g" );
var result1 = obj1.exec(string);
document.write("Returned value : " + result1);
var obj = new RegExp( "language", "g" );
var res = obj.exec(string);
document.write("<br />Returned value : " + res);
// use,document.write
输出：
Returned value：script
Returned value：language
