alert(/ruby/.test("ruby"));//true
alert(/[abc]/.test("a"));//true
alert(/[abc]/.test("b"));//true
alert(/[abc]/.test("c"));//true
alert("a bat ,a Cat,a fAt bat ,a faT cat".match(/[bcf]at/gi));//bat,Cat,fAt,bat,faT,cat

alert(/[^abc]/.test("a"));//false
alert(/[^abc]/.test("b"));//false
alert(/[^abc]/.test("6"));//true
alert(/[^abc]/.test("gg"));//true

alert(/[a-f]/.test("b"));//true
alert(/[a-f]/.test("k"));//false
alert(/[a-z]/.test("h"));//true
alert(/[A-Z]/.test("gg"));//false
alert(/[^H-Y]/.test("G"));//true
alert(/[0-9]/.test("8"));//true
alert(/[^7-9]/.test("6"));//true
 
alert(/[a-m1-5\n]/.test("a"))//true
alert(/[a-m1-5\n]/.test("3"))//true
var a = "\n\"
alert(/[a-m1-5\n]/.test(a))//true
alert(/[a-m1-5\n]/.test("r"))//false

alert(/\d/.test("3"))//true
alert(/\d/.test("w"))//false
alert(/\D/.test("w"))//true
alert(/\w/.test("w"))//true
alert(/\w/.test("司"))//false
alert(/\W/.test("徒"))//true
alert(/\s/.test(" "))//true
alert(/\S/.test(" "))//false
alert(/\S/.test("正"))//true
alert(/./.test("美"))//true
alert(/./.test("  "))//true
var a = "\n\"
alert(/./.test(a))//true

alert(/..../.test("司徒正美"))//true
alert(/司徒正美/.test("司徒正美"))//true
alert(/[\u4e00-\u9fa5]{4}/.test("司徒正美"))//true
alert(/[\u4e00-\u9fa5]{4}/.test("司徒正美55"))//true
alert(/^[\u4e00-\u9fa5]+$/.test("正则表达式"))//true
alert(/^[\u4e00-\u9fa5]+$/.test("正则表达式&*@@"))//false
alert(/\d{6}/.test("123456"))//true
alert(/[ruby]{2}/.test("rr"))//true
alert(/[ruby]{2}/.test("ru"))//true
alert(/[ruby]{2}/.test("ry"))//true

var re1 = /.*bbb/g;//贪婪
var re2 = /.*?bbb/g;//惰性
//  var re3 = /.*+bbb/g;//支配性,javascript不支持，IE与所有最新的标准浏览器都报错
alert(re1.test("abbbaabbbaaabbbb1234")+"");//true
alert(re1.exec("abbbaabbbaaabbbb1234")+"");//null
alert("abbbaabbbaaabbbb1234".match(re1)+"");//abbbaabbbaaabbbb
 
alert(re2.test("abbbaabbbaaabbbb1234")+"");//true
alert(re2.exec("abbbaabbbaaabbbb1234")+"");//aabbb
alert("abbbaabbbaaabbbb1234".match(re2)+"");//abbb,aabbb,aaabbb

//分组+量词
alert(/(dog){2}/.test("dogdog"))//true
//分组+范围
alert("baddad".match(/([bd]ad?)*/))//baddad,dad
//分组+分组
alert("mon and dad".match(/(mon( and dad)?)/))//mon and dad,mon and dad, and dad

var color = "#990000";
/#(\d+)/.test(color);
alert(RegExp.$1);//990000
 
alert(/(dog)\1/.test("dogdog"))//true
 
var num = "1234 5678";
var newNum = num.replace(/(\d{4}) (\d{4})/,"$2 $1");
alert(newNum)

var reg = /(red|black|yellow)!!/;
alert(reg.test("red!!"))//true
alert(reg.test("black!!"))//true
alert(reg.test("yellow!!"))//true

var color = "#990000";
/#(?:\d+)/.test(color);
alert(RegExp.$1);//""

var html = "
 
<a href="http://www.cnblogs.com/rubylouvre/">Ruby Louvre</a>by <em>司徒正美</em>
 
";
var text = html.replace(/&lt;(?:.|\s)*?&gt;/g, "");
alert(text)

var str1 = "bedroom";
var str2 = "bedding";
var reBed = /(bed(?=room))///在我们捕获bed这个字符串时，抢先去看接下来的字符串是不是room
alert(reBed.test(str1));//true
alert(RegExp.$1)//bed
alert(RegExp.$2 === "")//true
alert(reBed.test(str2))//false
 
var str1 = "bedroom";
var str2 = "bedding";
var reBed = /(bed(?!room))/  //要来它后面不能是room
alert(reBed.test(str1))//false
alert(reBed.test(str2))//true

var html = "
 
<a href="http://www.cnblogs.com/rubylouvre/">Ruby Louvre</a>
 
<hr />
 
by <em>司徒正美</em>
 
";
var text = html.replace(/&lt;(?!hr)(?:.|\s)*?&gt;/ig,"")
alert(text)//Ruby Louvre<hr />by 司徒正美

var a = "ruby";
String.prototype.capitalize =  function () {
     return this.replace(/^\w/, function (s) {
            return s.toUpperCase();
            });
        }
       alert(a.capitalize())//Ruby

var str = "12w-eefd&efrew";
alert(str.match(/\b\w+\b/g))//12w,eefd,efrew

var str = "JS's Louvre";
var reg = /\w/g;
alert(reg.exec(str));//J
alert(reg.lastIndex);//1
alert(reg.exec(str));//S
alert(reg.lastIndex);//2
alert(reg.exec(str));//s
alert(reg.lastIndex);//4
alert(reg.exec(str));//L
alert(reg.lastIndex);//6

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