JavaScript系列：正则表达式

function testExecResultType() {
            var txt = "mom and dad and baby";
            var pattern = /mom (and day (and baby)?)?/ig;
            var match = pattern.exec(txt);
            document.writeln("<br>match's type is instanceof array:" + (match instanceof Array));
            document.writeln("<br>Array.isArray(matches):" + Array.isArray(match));
        }

        function testTelNum() {
            var p1 = /^1\d{10}$/g;
            var pattern = new RegExp(p1.source, "g");
            var telNum1 = "13088888888";
            var telNum2 = "13300008888";
            document.writeln("<br>" + telNum1 + " is telNum:" + pattern.test(telNum1));
            pattern.lastIndex = 0;
            document.writeln("<br>" + telNum2 + " is telNum:" + pattern.test(telNum2));
        }

        function testIfIsPatternObjectIsGlobal() {
            var p = /\w+@\w+\.com/g;
            var mail = "zhangsan@amail.com";
            document.writeln("<br>" + mail + " is mail?" + p.test(mail));
            document.writeln("<br>lastIndex: " + p.lastIndex);
            p = /^1\d{10}/g;
            document.writeln("<br>lastIndex: " + p.lastIndex);
            var telNum = "13088888888";
            document.writeln("<br>" + telNum +" is telNum? " + p.test(telNum));            
        }
        testIfIsPatternObjectIsGlobal();
        //testTelNum();
        //testExecResultType();