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/*=========================正则表达式=========================*/ //创建正则表达式 //1.采用new运算符 var book1 = new RegExp('Book','ig'); //i:忽略大小写 g:全局匹配 //2.字面量方式 var book2 = /book/; var str = "this is a book! realy book"; document.write(book1.test(str)); document.write(book1.exec(str)); //String对象中的正则表达式方法 //match var apple = /apple/ig; var strapp = 'this is a apple,that is apple too!'; document.write(strapp.match(apple)); document.write(strapp.match(apple).length); //search var boy = /boy/ig; var strboy = 'this is a boy,that is boy too!'; document.write(strboy.search(boy)); //返回查找到的位置,没有查找到返回-1。ps:search无需g全局,因为找到就返回 //replace var pattern = /Box/ig; var strBox = "this is Box,that is Box!"; document.write(strBox.replace(pattern,'desk')); //将Box替换成desk //split var patstr = / /ig; var myStr = 'this is Box! that is Box!'; document.write(myStr.split(patstr)); //用空格拆分成数组 //RegExp的静态属性 var patgoogle = /googl(e)/; var googleStr = 'this is google!'; patgoogle.test(googleStr); document.write(RegExp.input); document.write(RegExp.leftContext); document.write(RegExp.rightContext); document.write(RegExp.lastMatch); document.write(RegExp.lastParen); //RegExp对象的实例属性 var patbook = /book/igm; var bookStr = 'book,book,book!'; document.write(patbook.global); document.write(patbook.ignoreCase); document.write(patbook.multiline); document.write(patbook.source); document.write(patbook.lastIndex); //下次的匹配位置 patbook.test(bookStr); document.write(patbook.lastIndex); patbook.lastIndex = 10; document.write(patbook.lastIndex); // //使用点元字符 var pat = /g..gle/; //.:表示匹配任意字符 var str = 'google'; document.write(pat.test(str)); //重复匹配 var pat1 = /go*gle/; //o*:表示匹配任意多个o(包括0个) var str1 = 'gogle'; document.write(pat1.test(str1)); var pat2 = /go+gle/; //o+:表示匹配至少一个o var str2 = 'gooogle'; document.write(pat2.test(str2)); var pat3 = /go?gle/; //o?:表示匹配0或者1个o var str3 = 'ggle'; document.write(pat3.test(str3)); var pat4 = /go{2,4}gle/; //o{2,4}:表示匹配2-4个o var str4 = 'goooogle'; document.write(pat4.test(str4)); var pat5 = /go{2}gle/; //o{2}:表示限定俩个o var str5 = 'google'; document.write(pat5.test(str5)); var pat6 = /go{2,}gle/; //o{2,}:表示俩个及其以上的o var str6 = 'goooogle'; document.write(pat6.test(str6)); //字符匹配 var mat = /[a-zA-Z0-9]oogle/; //[a-z]:表示26个小写英文字符中的任意一个都匹配,[a-zA-Z0-9]:表示字母数字全匹配 var matstr = '3oogle'; document.write(mat.test(matstr)); var mat1 = /[^0-9]oogle/; //[^0-9]:表示非0-9都匹配 var matstr1 = 'qoogle'; document.write(mat1.test(matstr1)); //锚元字符匹配 var yuan = /^[a-z]oogle/; //[]前的^表示行首匹配,[]里的^表示非 var yuanstr = 'ggoogle'; document.write(yuan.test(yuanstr)); var yuan = /^[a-z]oogle$/; //[]前的^表示行首匹配,$尾匹配 var yuanstr = 'google1'; document.write(yuan.test(yuanstr)); var yuan1 = /\woogle/; //\w表示数字字母下划线[0-9a-zA-A_] var yuanstr1 = 'ggoogle'; document.write(yuan1.test(yuanstr1)); var yuan2 = /\Woogle/; //\W表示非数字字母下划线[^0-9a-zA-A_] var yuanstr2 = 'ggoogle'; document.write(yuan2.test(yuanstr2)); var yuan3 = /\doogle/; //\d表示数字[0-9] var yuanstr3 = '2oogle'; document.write(yuan3.test(yuanstr3)); var yuan4 = /\Doogle/; //\D表示非数字[^0-9] var yuanstr4 = 'ggoogle'; document.write(yuan4.test(yuanstr4)); var space = /goo\s*gle/; //\s表示匹配空格 制表符 var spacestr = 'goo gle'; document.write(space.test(spacestr)); var space1 = /google\b/; //\b表示是否到达边界 var spacestr1 = 'google end'; document.write(space1.test(spacestr1)); var space2 = /google|baidu|bing/; //|表示或匹配 var spacestr2 = 'this is bing'; document.write(space2.test(spacestr2)); //分组 var div = /123(google){2,3}/; var divstr = 'this is 123googlegoogle'; document.write(div.test(divstr)); var div1 = /8(.*)8/; //.*表示任意字符 var divstr1 = 'this is 8google8'; document.write(div1.test(divstr1)); document.write(RegExp.$1); //$1表示第一个分组的内容 var div2 = /8(.*)8/; //.*表示任意字符 var divstr2 = 'this is 8google8'; document.write(divstr2.replace(div2,'<strong>$1</strong>')); //加粗分组一 var div3 = /(.*)\s(.*)/; var divstr3 = 'google baidu'; document.write(divstr3.replace(div3,'$2,$1') +'<br>'); //交换分组一和分组二的顺序 var div4 = /^([a-z]*)\s([0-9]{4})$/; // /^(?:[a-z]*)\s(?:[0-9]{4})$/ 非捕获性分组,?:表示不会捕获这个分组 var divstr4 = 'google 2016'; document.write(div4.exec(divstr4)); //google 2016,google,2016 :数组0-表示匹配的全部,数组1-表示匹配的分组一,数组2-表示匹配的分组二 //贪婪和惰性 var google = /8(.*?)8/g; //加?,使用惰性; 加g,使用全局 var googlestr = '8google8 8google8 8google8 8google8'; document.write(googlestr.replace(google,'<strong>$1</strong>')); var google1 = /8([^8]*)8/g; //不匹配8 var googlestr1 = '8google8 8google8 8google8 8google8'; document.write(googlestr1.replace(google1,'<strong>$1</strong>')); //前瞻性捕获 var google2 = /goo(?=gle)/; var googlestr2 = 'google'; document.write(google2.exec(googlestr2)); //返回的是goo //正在表达式用到的特殊符号,前面需要加转义符 var change = /\[\]/; var changestr = '[]'; document.write(change.test(changestr)); //使用换行模式 var row = /^[0-9]+/gm; //如果限定了行首匹配,则需要开启换行模式 var rowstr = '1.baidu\n2.google\n3.bing'; document.write(rowstr.replace(row,'#')); //常用的正则 //检查邮政编码 var post = /[1-9][0-9]{5}/; //6位数字,第一位不能是0 var poststr = '402207'; document.write(post.test(poststr)); //检测文件压缩包 //var com = /^[\w\-]+\.zip|rar|gz$/; var com = /zip$|rar$|gz$/; var comstr = 'abc-123.rar'; document.write(com.test(comstr)); //删除多余空格 var spastr = ' abc 123 345 678'; var spa = /[\s]+/g; document.write(spastr.replace(spa,'')); //删除首尾空格 //方法一:依次去掉首尾 var headstr = ' goo gle '; //alert('|' + headstr + '|'); var head = /^[\s]+/; var headstr1 = headstr.replace(head,''); //alert('|' + headstr1 + '|'); var tail = /[\s]+$/; //alert('|' + headstr1.replace(tail,'') + '|'); //方法二:利用分组 var distr = ' goo gle '; var di = /(^\s+)(.*?)(\s+$)/; //加?,使用惰性 //alert(di.exec(distr)[2]); //alert(distr.replace(di,'$2')); //电子邮件验证 var mailstr = 'jin_yaoshi@163.com'; var mail = /^([\w_/./-]+)@([\w\-]+)\.([a-zA-Z]{2,4})$/; document.write(mail.test(mailstr));