正则表达式必知必会（修订版）
//匹配一组字符串
//[ns]a..xls
var baseText4 = "na1.xls
1as.xls
ca1.xls
sa1.xls"
//[Rr]eg[Ee]x
var baseText5 = "The phrase 'regular expression' is often abbreviated ad RegEx or regex"
//[ns]a[0-9].xls
var baseText6 = "na1.xls
1as.xls
ca1.xls
sa1.xls
sam.xls"
//#[0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F]
var baseText7 = "background:#336633;color:#f1f1f1;padding:10px;"
//取非匹配
//[ns]a[^0-9].xls
// baseText6
//元字符 ： 无法用本身代表本身
// . [ ] 等
// myArray[[O-9]]
var baseText8 = " var myArray = new Array()" +
"for(myArray[0]==0){}; myArray[1]==1"
// \
var baseText9 = "\home\ben\sss"
//空白元字符
// [] f
v
// d 数字 D 非数字
// w 字母数字下划线 W 非字母数字下划线
var baseText10 = "11213
1d23d
22212
_ssd123
abcde
_2d21d"
// s 空白字符串 S 非空白字符串
//十六进制、 八进制
//十六进制 x
//八进制
//POSIX字符 可移植操作系统接口
//
//重复匹配
//
// w{2,5}@baidu.com
var baseText11 = "b@baidu.com
ben@baidu.com
4093@baidu.com"
// w+@w+.w+
var baseText12 = 'send personal email to ben@forta.com
For questions about a book use support@forta.com
Feel free to send unsolicited email to spam@forta.com '
//[w.]+@[w.]+.w+
var baseText13 = 'send personal email to ben@forta.com or ben.forta@firta.com
' +
'For questions about a book use support@forta.com
' +
'if you message is ugrent try ben@urgent.forta.com.
'+
'Feel free to send unsolicited email to spam@forta.com '
//w+[w.]*@[w.]+.w+
var baseText14 = "hello .ben@forta.com is my email address"
//http[s]?://[w./]* or https?://[w./]*
var baseText15 = "The URL is http://www.forta.com/ ,
" +
"to connect securely use https://www.forta.com/ instead.
" +
"https://www.baidu.com/se/"
//匹配的重复次数
//+ * 匹配的字符个数没有上限
// + * ？至少匹配0个或者1个字符
// {} 来设定一个精确地匹配次数的值
// d{1,2}[-/]d{1,2}[-/]d{2,4} 匹配 日期 月份 年份
var baseText16 = "4/8/03
10-6-2004
+2/2/2
01-01-01"
// d+:$d{3,}.d{2} 寻找大于$100的
var baseText17 = '1001:$496.80
1002:$1290.69
' +
'1003:$26.43
1004:$613.42
1005:$5.23'
// 贪婪型匹配 * + {n,} 他们会尽可能从一行文本的头部匹配到末尾
// 懒惰型匹配 *？ +? {n,}? 他们会匹配尽可能少的字符
// <[Bb]>.*?</[Bb]> 匹配b标签
var baseText18 = 'This offer is not available to customers living in <B>ak</B> and <B>HI</B>'
//
//位置匹配
//
// cat
var baseText19 = 'The cat scattered his food all over the room'
// B-B 多个单词边界
var baseText20 = 'the cat scattered his food all over - the room '
// <?xml.*?>
var baseText21 = '<?xml version="1.0" encoding="UTF-8" ?>
' +
'<wsdl:definition-src xmlns:wsdl="http://www.w3.org/1999/html">'
// ^s*<?xml.*?> 非空开头查找xml
var baseText22 = 'this is bad ,real bad
' +
'<?xml version="1.0" encoding="UTF-8" ?>
' +
'<wsdl:definition-src xmlns:wsdl="http://www.w3.org/1999/html">'
//
//分行匹配模式
//(?m)^s*//.*$ 查找注释的正则
//
//子表达式
//
//
//(d{1,3}.){3}d{1,3} ip 查找
var baseText23 = 'Pinging hog.forta.com [12.159.46.200]
' +
'with 32 bytes of data:'
//(19|20)d{2} 查找4位年份
var baseText24 = "ID:042
" +
"sex: M
" +
"DOB: 1967-08-17
" +
"Status: Active"
//一个完整的ip匹配
//(((d{1,2})|(1d{2})|(2[0-4]d)|(25[0-5])).){3}((d{1,2})|(1d{2})|(2[0-4]d)|(25[0-5]))
//
//回溯引用： 前后一致匹配
//
//回溯允许后面的正则引用前面的匹配结果
//[ ]+(w+)[ ]+1
var baseText25 = 'this is a block of text, several words here are are repeated,
' +
' and and they should not be .'
//<[hH]([1-6])>.*?</[hH]1> 正确匹配每一个H标签 （不会匹配“<h2></h1>”）
//回溯例子： mail替换
//replace( (w+[w.]*@[w.]+.w+) , <a href="mailto:$1">$1</a> )
// 替换前
var baseText26 = "my email is 40935539@qq.com, welcome send to me "
// 替换后
// my email is <a href="mailto:409355439@qq.com">409355439@qq.com</a>, welcome send to me
//替换前
var baseText27 = "313 - 555 - 1234
" +
"248 - 555 - 9999
" +
"810 - 555 - 9000"
// replace( (d{3})( - )(d{3})( - )(d{4}) , ($1) $3 - $5 )
//替换后
// (313) 555 - 1234 (248) 555 - 9999 (810) 555 - 9000
//
//前后查找 JS不支持向后查找
//
//lookahead
//lookbehind
var baseText28 = "http://www.forta.com
" +
"http://mail.forta.com
" +
"ftp://ftp.forta.com"
//向前查找 + 向后查找
//(?<=([hH][1-9]>)).*(?=</[hH][1-9]>)
//example: " <h3>REGEXP</h3>"
//取非
//正向前查找(?=) 负向前查找(?!)
//正向前查找(?<=) 负向后查找(?<!)
//(?<!$)d+ 查找不含$的数字
var baseText29 = "i paid $30 for 100 apples, 50 organges ,and 60 pears . i saved $5 on this order ."