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();