1.RegExp对象：五个属性二个方法
五个属性：global, ignoreCase,multiline,lastIndex,source
二个方法：
exec()--模式匹配
test()--检测一个字符串是否含有某个模式
2.例子
var pattern = /\bJava\w*\b/g;
var text = 'JavaScript is more fun than Java or JavaBeans!';
var result;
while((result = pattern.exec(text)) != null){
console.log('Matched! '+result[0] +' at position '+result.index +' next search begins at position '+pattern.lastIndex); }
//结果
Matched! JavaScript at position 0 next search begins at position 10
Matched! Java at position 28 next search begins at position 32
Matched! JavaBeans at position 36 next search begins at position 45