JavaScript正则表达式-相关的String对象方法

var reg_pattern = /a\d/;

var str = "apple,a2,b3,a4";

var arr_m = str.match(reg_pattern);

s1 = arr_m[0];//s1 = "a2"

index = arr_m.index;//index = 6

st = arr_m.input;//st = "apple,a2,b3,a4"

var reg_pattern = /a\d/g;//g表示搜索所有匹配的字符串

var str = "apple,a2,b3,a4";

var arr_m = str.match(reg_pattern);

arr_m[0] = a2;

arr_m[1] = a4;

str = "英文字符串中的英文字符";

str2 = str.replace(/英/,"中");//中文字符串中的英文字符

str2 = str.replace(/英/g,"中");//中文字符串中的中文字符

var str = "apple,a2,b3,a4";

var strE = str.replace(/a\d/g, function(str){  

　　return str.substr(0,1).toUpperCase() + str.substr(1);

});//strE = "apple,A2,b3,A4";

var str = "china_dragon@sohu.com";

var index = str.search(/@/);