正则表达式学习笔记

时间:2022-06-01 16:49:55
符号 说明 示例 备注
. 匹配除\n的任意单个字符
Regex.IsMatch("acb", "a.b");匹配成功
Regex.IsMatch("accb", "a.b");匹配失败
当.出现在中括号[]中的时候,本身就表示一个普通的.,已经不再是“元字符”了。
[] 匹配括号内任意单个字符 Regex.IsMatch(“a0b”,”a[0-9]b”)匹配成功
Regex.IsMatch(“a01b”,”a[0-9]b”)匹配失败(必须是单个字符)
 
| Regex.IsMatch("z", "z|food");匹配成功
Regex.IsMatch("d", "z|food");匹配失败
优先级低,最后才计算
() 改变优先级,提取分组 Regex.IsMatch("axb", "a(x|y)b");匹配成功
Regex.IsMatch("axxb", "a(x|y)b");匹配失败
 
{n} 表示前面的表达式必须出现n次 Regex.IsMatch("aaaa", "a{3}");匹配成功  
{n,} 表示前面的表达式至少出现n次 Regex.IsMatch("aaaa", "a{3,}");匹配成功  
{n,m} 表示前面的表达式只是至少n次,最多出现m次 Regex.IsMatch("aaaa", "a{5,6}");匹配失败
Regex.IsMatch("aaaaaaa", "a{5,6}");匹配失败
 
$
字符串的结尾
Regex.IsMatch("za", "^za");匹配成功
Regex.IsMatch("za", "^za");匹配失败
 
^ 字符串的开头 Regex.IsMatch("za", "^za");匹配成功
Regex.IsMatch("za", "^za");匹配失败
在中括号中表示非[^]
* 表示前面表达式出现多次    
+ 表示前面的表达式出现1或多次    
? 表示前面表达式出现0或1次   ?可以用来终止贪婪模式
\d 表示[0-9]   比[0-9]多的是,也可以匹配全角下的数字
\D 与\d相反,除数字外任意字符    
\s 表示空白符    
\S 与\s相反,非空白符   匹配所有字符可以用[\s\S]
\w 表示[a-zA-Z0-9]   比[a-zA-Z0-9]多的是,也可以匹配全角下的字母数字
\W 与\w相反    
\b 表示单词边界,即不是单词的字符,如逗号空格,但特殊符号如¥$#就不是单词边界    

备注:

1、|的优先级最低,需要特别注意

正则:z|food表示字符串中出现z或food都可以匹配成功

正则表达式学习笔记

2、^z|food$由于|优先级最低,所以只要以z开头或以food结尾即匹配

正则表达式学习笔记

3、^(z|food)$,括号提高了|的优先级,表示必须以z开头并结尾或,以food开头并结尾。也就是只有z和food可以匹配成功

正则表达式学习笔记

函数:

Regax.IsMatch()

regex.IsMatch表示只要整个字符串有任何一部分可以匹配该正则表达式,返回ture

由于net默认采用unicode匹配方式,所以\d也匹配全角数字,解决办法:Regex.IsMatch("", @"\w",RegexOptions.ECMAScript);用欧洲计算机的标准

案例:匹配是否为>=10并且小于等于20的数组

Regex.IsMatch(msg, @"^(1[0-9]|20)$");记得不能写成^[1-2][0-9]$,这样表示必须以1或2开头,中间不能有字符,并以0-9结尾,而29也会被匹配。

 

#region 2、判断是否是合法的日期格式“2008-08-08”。四位数字-两位数字-两位数字。 
while (true)
{
Console.WriteLine(
"请输入日期:");
string date = Console.ReadLine();
bool b = Regex.IsMatch(date, @"^\d{4}-\d{1,2}-\d{1,2}$", RegexOptions.ECMAScript);
Console.WriteLine(b);
}

#endregion
Regax.Replace()

在指定的输入字符串内,使用指定的替换字符串替换与某个正则表达式模式匹配的字符串。

msdn介绍:http://msdn.microsoft.com/zh-cn/library/system.text.regularexpressions.regex.replace.aspx

正则表达式学习笔记

案例:去除重复字符,只保留一个

string msg = "杨杨杨杨杨中中中中科科科科科"; 
//\1、\2、\3、...这种写法就表示“反向引用”,在字符串替换中引用分组是使用$1方式,在正则表达式内部引用分组信息是使用\1这种方式。
msg = Regex.Replace(msg, @"(.)\1+", "$1");
Console.WriteLine(msg);
Console.ReadKey();

 

Regex.match()

在输入字符串中搜索正则表达式的匹配项,并将精确结果作为单个 Match 对象返回。

一般字符串提取时不需要加^$,因为是在字符处找出一部分和该正则表达式匹配的元素,然后提取,所以不是完全匹配。

msdn里的介绍:http://technet.microsoft.com/zh-cn/library/system.text.regularexpressions.regex.match(v=vs.90).aspx

正则表达式学习笔记

案例:

从“June 26 , 1951 ”中提取出月份June、26、1951来。@"([a-zA-Z]+)\s+\d{1,2},\s*\d{4}"进行匹配。月份和日之间是必须要有空格分割的,

所以使用空白符号“\s”匹配所有的空白字符,此处的空格是必须有的,所以使用“+”标识为匹配1至多个空格。之后的“,”与年份之间的空格是可有可无的,所以使用“*”表示为匹配0至多个

string msg = "June 26 , 1951 "; 
Match match
= Regex.Match(msg, @"^([a-zA-Z]+)\s*(\d{1,2})\s*,\s*(\d{4})\s*$");
Console.WriteLine(match.Groups[
1].Value);
Console.WriteLine(match.Groups[
2].Value);
Console.WriteLine(match.Groups[
3].Value);
Console.ReadKey();
 
Regex.Matches():

在输入字符串中搜索正则表达式的所有匹配项并返回所有匹配。

msdn里的介绍:http://msdn.microsoft.com/zh-cn/library/system.text.regularexpressions.regex.matches.aspx

正则表达式学习笔记

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<font color="green" size="-1">作者:<a href="http://my.tianya.cn/13316515" class="tz_auto" target="_blank">ktery</a><span value="13316515" name="userid_13316515" style="float: none; display: inline;"></span>&nbsp;提交日期:2007-08-24 18:48:00&nbsp;访问:8798&nbsp;回复:132</font>
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&nbsp;女 &nbsp;true188@gmail.com &nbsp;&nbsp;20岁
<div class="fs-newline"></div>
</div>
<div class="content">
<p style="background: none repeat scroll 0% 0% rgb(238, 238, 238);" id="my_tomy_p">
<a href="javascript:void(0)" class="button-my-follow" onclick="__my.action.follow(&#39;http://my.tianya.cn/interface/recommend/follow.jsp?act=addfollowbypop&amp;username=ktery&#39;)">关注楼主</a>
<a href="javascript:void(0)" class="button-my-collect" onclick="__my.action.collect(&#39;http://my.tianya.cn/interface/user/aritcleCollect.jsp?act=addcollectbypop&amp;type=%E6%9D%A5%E5%90%A7&amp;title=%E5%A4%A7%E5%AE%B6%E7%95%99%E4%B8%8Bemail%E4%BA%A4%E5%8F%8B%E5%90%A7&amp;url=http%3A%2F%2Flaiba.tianya.cn%2Ftribe%2FshowArticle.jsp%3FgroupId%3D93803%26articleId%3D255105449041749990113803&amp;head=email&amp;uid=&amp;uname=&#39;)">收藏</a>
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<div id="ReContent2589394907554643968" style="word-wrap: break-word;">
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<tbody><tr>
<td width="206" valign="bottom" align="right"></td>
<td width="500" align="center"><font size="-1" color="green">
<font color="green" size="-1">作者:<a href="http://my.tianya.cn/39043556" class="tz_auto" target="_blank">来吧路人甲</a><span value="39043556" name="userid_39043556" style="float: none; display: inline;"></span>&nbsp;提交日期:2008-03-18 10:09:00&nbsp;</font>
</font></td>
<td width="206" align="right" style="padding-right:10px;">

</td>
<td align="right">1#</td>
</tr>
</tbody></table>
<div id="content2589394907554643968" class="content"> enc.succeed@gmail.com
</div>
</div>

<div id="ReContent2592635225314511790" style="word-wrap: break-word;">
<table cellspacing="0" border="0" bgcolor="#F5F9FA" width="100%">
<tbody><tr>
<td width="206" valign="bottom" align="right"></td>
<td width="500" align="center"><font size="-1" color="green">
<font color="green" size="-1">作者:<a href="http://my.tianya.cn/39043556" class="tz_auto" target="_blank">来吧路人甲</a><span value="39043556" name="userid_39043556" style="float: none; display: inline;"></span>&nbsp;提交日期:2008-04-04 21:17:00&nbsp;</font>
</font></td>
<td width="206" align="right" style="padding-right:10px;">

</td>
<td align="right">2#</td>
</tr>
</tbody></table>
<div id="content2592635225314511790" class="content"> shangdonglsk@126.com
</div>
</div>

<div id="ReContent2594804024842131180" style="word-wrap: break-word;">
<table cellspacing="0" border="0" bgcolor="#F5F9FA" width="100%">
<tbody><tr>
<td width="206" valign="bottom" align="right"></td>
<td width="500" align="center"><font size="-1" color="green">
<font color="green" size="-1">作者:<a href="http://my.tianya.cn/39043556" class="tz_auto" target="_blank">来吧路人甲</a><span value="39043556" name="userid_39043556" style="float: none; display: inline;"></span>&nbsp;提交日期:2008-04-16 13:49:00&nbsp;</font>
</font></td>
<td width="206" align="right" style="padding-right:10px;">

</td>
<td align="right">3#</td>
</tr>
</tbody></table>
<div id="content2594804024842131180" class="content"> xxxwuxiaoyyy@126.com
</div>
</div>

<div id="ReContent2598213229032941240" style="word-wrap: break-word;">
<table cellspacing="0" border="0" bgcolor="#F5F9FA" width="100%">
<tbody><tr>
<td width="206" valign="bottom" align="right"></td>
<td width="500" align="center"><font size="-1" color="green">
<font color="green" size="-1">作者:<a href="http://my.tianya.cn/39043556" class="tz_auto" target="_blank">来吧路人甲</a><span value="39043556" name="userid_39043556" style="float: none; display: inline;"></span>&nbsp;提交日期:2008-05-04 22:48:00&nbsp;</font>
</font></td>
<td width="206" align="right" style="padding-right:10px;">

</td>
<td align="right">4#</td>
</tr>
</tbody></table>
<div id="content2598213229032941240" class="content"> kyle.qiao@gmail.com
</div>
</div>

<div id="ReContent2601138382351804551" style="word-wrap: break-word;">
<table cellspacing="0" border="0" bgcolor="#F5F9FA" width="100%">
<tbody><tr>
<td width="206" valign="bottom" align="right"></td>
<td width="500" align="center"><font size="-1" color="green">
<font color="green" size="-1">作者:<a href="http://my.tianya.cn/39043556" class="tz_auto" target="_blank">来吧路人甲</a><span value="39043556" name="userid_39043556" style="float: none; display: inline;"></span>&nbsp;提交日期:2008-05-20 17:10:00&nbsp;</font>
</font></td>
<td width="206" align="right" style="padding-right:10px;">

</td>
<td align="right">5#</td>
</tr>
</tbody></table>
<div id="content2601138382351804551" class="content"> erniu.zw@163.com
<div class="fs-newline"></div> <div class="fs-newline"></div>叫我二牛就成了,男,26岁了
<div class="fs-newline"></div>喜欢结交天南地北的朋友
</div>
</div>

<div id="ReContent2601150278141395442" style="word-wrap: break-word;">
<table cellspacing="0" border="0" bgcolor="#F5F9FA" width="100%">
<tbody><tr>
<td width="206" valign="bottom" align="right"></td>
<td width="500" align="center"><font size="-1" color="green">
<font color="green" size="-1">作者:<a href="http://my.tianya.cn/16787047" class="tz_auto" target="_blank">smakye</a><span value="16787047" name="userid_16787047" style="float: none; display: inline; "><a href="http://807.tianya.cn/count?t=EsHTQDHjb9uCrdbqZrng&backurl=http://passport.tianya.cn/portect?action=smsintro&from=successtiezitubiao" title="手机认证用户" target="_blank"><img border="0" align="absmiddle" src="./大家留下email交友吧_email_天涯社区_files/1291094730345.gif" width="16" height="16"></a></span>&nbsp;提交日期:2008-05-20 18:43:00&nbsp;</font>
</font></td>
<td width="206" align="right" style="padding-right:10px;">

</td>
<td align="right">6#</td>
</tr>
</tbody></table>
<div id="content2601150278141395442" class="content"> 怎么全是匿名?
<div class="fs-newline"></div>我都有点不敢写了~
<div class="fs-newline"></div>gsh@w.cn
<div class="fs-newline"></div>(windows live 的邮箱,和hotmail一样)
</div>
</div>

<div id="ReContent2603786782140802015" style="word-wrap: break-word;">
<table cellspacing="0" border="0" bgcolor="#F5F9FA" width="100%">
<tbody><tr>
<td width="206" valign="bottom" align="right"></td>
<td width="500" align="center"><font size="-1" color="green">
<font color="green" size="-1">作者:<a href="http://my.tianya.cn/39043556" class="tz_auto" target="_blank">来吧路人甲</a><span value="39043556" name="userid_39043556" style="float: none; display: inline;"></span>&nbsp;提交日期:2008-06-03 23:45:00&nbsp;</font>
</font></td>
<td width="206" align="right" style="padding-right:10px;">

</td>
<td align="right">7#</td>
</tr>
</tbody></table>
<div id="content2603786782140802015" class="content"> 此男生猛,生人勿近(:)开玩笑)uprich@sohu.com
</div>
</div>

<div id="ReContent2605037186691209042" style="word-wrap: break-word;">
<table cellspacing="0" border="0" bgcolor="#F5F9FA" width="100%">
<tbody><tr>
<td width="206" valign="bottom" align="right"></td>
<td width="500" align="center"><font size="-1" color="green">
<font color="green" size="-1">作者:<a href="http://my.tianya.cn/39043556" class="tz_auto" target="_blank">来吧路人甲</a><span value="39043556" name="userid_39043556" style="float: none; display: inline;"></span>&nbsp;提交日期:2008-06-10 17:29:00&nbsp;</font>
</font></td>
<td width="206" align="right" style="padding-right:10px;">

</td>
<td align="right">8#</td>
</tr>
</tbody></table>
<div id="content2605037186691209042" class="content"> ericluj@sina.com 男 22岁
</div>
</div>

<div id="ReContent2613158912077871924" style="word-wrap: break-word;">
<table cellspacing="0" border="0" bgcolor="#F5F9FA" width="100%">
<tbody><tr>
<td width="206" valign="bottom" align="right"></td>
<td width="500" align="center"><font size="-1" color="green">
<font color="green" size="-1">作者:<a href="http://my.tianya.cn/39043556" class="tz_auto" target="_blank">来吧路人甲</a><span value="39043556" name="userid_39043556" style="float: none; display: inline;"></span>&nbsp;提交日期:2008-07-24 12:02:00&nbsp;</font>
</font></td>
<td width="206" align="right" style="padding-right:10px;">

</td>
<td align="right">9#</td>
</tr>
</tbody></table>
<div id="content2613158912077871924" class="content"> 你好:
<div class="fs-newline"></div> &nbsp;&nbsp;&nbsp;&nbsp;我是刚毕业的大学生,很想交朋友,only普通朋友
<div class="fs-newline"></div>     www.cinderlla@163.com .
<div class="fs-newline"></div> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;wodengnimen
<div class="fs-newline"></div>
</div>
</div>

<div id="ReContent2615414444092651400" style="word-wrap: break-word;">
<table cellspacing="0" border="0" bgcolor="#F5F9FA" width="100%">
<tbody><tr>
<td width="206" valign="bottom" align="right"></td>
<td width="500" align="center"><font size="-1" color="green">
<font color="green" size="-1">作者:<a href="http://my.tianya.cn/39043556" class="tz_auto" target="_blank">来吧路人甲</a><span value="39043556" name="userid_39043556" style="float: none; display: inline;"></span>&nbsp;提交日期:2008-08-05 15:47:00&nbsp;</font>
</font></td>
<td width="206" align="right" style="padding-right:10px;">

</td>
<td align="right">10#</td>
</tr>
</tbody></table>
<div id="content2615414444092651400" class="content"> coolcliff01@yahoo.com.tw
</div>
</div>

<div id="ReContent2615566797579444033" style="word-wrap: break-word;">
<table cellspacing="0" border="0" bgcolor="#F5F9FA" width="100%">
<tbody><tr>
<td width="206" valign="bottom" align="right"></td>
<td width="500" align="center"><font size="-1" color="green">
<font color="green" size="-1">作者:<a href="http://my.tianya.cn/17052816" class="tz_auto" target="_blank">yanyufei0918</a><span value="17052816" name="userid_17052816" style="float: none; display: inline; "><a href="http://807.tianya.cn/count?t=EsHTQDHjb9uCrdbqZrng&backurl=http://passport.tianya.cn/portect?action=smsintro&from=successtiezitubiao" title="手机认证用户" target="_blank"><img border="0" align="absmiddle" src="./大家留下email交友吧_email_天涯社区_files/1291094730345.gif" width="16" height="16"></a></span>&nbsp;提交日期:2008-08-06 11:30:00&nbsp;</font>
</font></td>
<td width="206" align="right" style="padding-right:10px;">

</td>
<td align="right">11#</td>
</tr>
</tbody></table>
<div id="content2615566797579444033" class="content"> 本人一哥哥 yanyufei0918@163.com
</div>
</div>

<div id="ReContent2617277774718364958" style="word-wrap: break-word;">
<table cellspacing="0" border="0" bgcolor="#F5F9FA" width="100%">
<tbody><tr>
<td width="206" valign="bottom" align="right"></td>
<td width="500" align="center"><font size="-1" color="green">
<font color="green" size="-1">作者:<a href="http://my.tianya.cn/39043556" class="tz_auto" target="_blank">来吧路人甲</a><span value="39043556" name="userid_39043556" style="float: none; display: inline;"></span>&nbsp;提交日期:2008-08-15 16:48:00&nbsp;</font>
</font></td>
<td width="206" align="right" style="padding-right:10px;">

</td>
<td align="right">12#</td>
</tr>
</tbody></table>
<div id="content2617277774718364958" class="content"> wbxxny@gmail.com
<div class="fs-newline"></div> <div class="fs-newline"></div>年龄:26
<div class="fs-newline"></div>性别:男
<div class="fs-newline"></div>地区:甘肃
<div class="fs-newline"></div>qq太无趣,希望可以通过e_mail交流。有意者发!
</div>
</div>

<div id="ReContent2619165612932635701" style="word-wrap: break-word;">
<table cellspacing="0" border="0" bgcolor="#F5F9FA" width="100%">
<tbody><tr>
<td width="206" valign="bottom" align="right"></td>
<td width="500" align="center"><font size="-1" color="green">
<font color="green" size="-1">作者:<a href="http://my.tianya.cn/39043556" class="tz_auto" target="_blank">来吧路人甲</a><span value="39043556" name="userid_39043556" style="float: none; display: inline;"></span>&nbsp;提交日期:2008-08-25 21:00:00&nbsp;</font>
</font></td>
<td width="206" align="right" style="padding-right:10px;">

</td>
<td align="right">13#</td>
</tr>
</tbody></table>
<div id="content2619165612932635701" class="content"> 对楼上的话深表赞同
<div class="fs-newline"></div>aprmch@gmail.com
</div>
</div>

<div id="ReContent2620019554840699175" style="word-wrap: break-word;">
<table cellspacing="0" border="0" bgcolor="#F5F9FA" width="100%">
<tbody><tr>
<td width="206" valign="bottom" align="right"></td>
<td width="500" align="center"><font size="-1" color="green">
<font color="green" size="-1">作者:<a href="http://my.tianya.cn/39043556" class="tz_auto" target="_blank">来吧路人甲</a><span value="39043556" name="userid_39043556" style="float: none; display: inline;"></span>&nbsp;提交日期:2008-08-30 11:27:00&nbsp;</font>
</font></td>
<td width="206" align="right" style="padding-right:10px;">

</td>
<td align="right">14#</td>
</tr>
</tbody></table>
<div id="content2620019554840699175" class="content"> YLX857857857@163.COM &nbsp;男 交朋友
</div>
</div>

<div id="ReContent2621003016312279969" style="word-wrap: break-word;">
<table cellspacing="0" border="0" bgcolor="#F5F9FA" width="100%">
<tbody><tr>
<td width="206" valign="bottom" align="right"></td>
<td width="500" align="center"><font size="-1" color="green">
<font color="green" size="-1">作者:<a href="http://my.tianya.cn/39043556" class="tz_auto" target="_blank">来吧路人甲</a><span value="39043556" name="userid_39043556" style="float: none; display: inline;"></span>&nbsp;提交日期:2008-09-04 18:40:00&nbsp;</font>
</font></td>
<td width="206" align="right" style="padding-right:10px;">

</td>
<td align="right">15#</td>
</tr>
</tbody></table>
<div id="content2621003016312279969" class="content"> x4long@163.com
</div>
</div>

<div id="ReContent2621003196703169702" style="word-wrap: break-word;">
<table cellspacing="0" border="0" bgcolor="#F5F9FA" width="100%">
<tbody><tr>
<td width="206" valign="bottom" align="right"></td>
<td width="500" align="center"><font size="-1" color="green">
<font color="green" size="-1">作者:<a href="http://my.tianya.cn/39043556" class="tz_auto" target="_blank">来吧路人甲</a><span value="39043556" name="userid_39043556" style="float: none; display: inline;"></span>&nbsp;提交日期:2008-09-04 18:42:00&nbsp;</font>
</font></td>
<td width="206" align="right" style="padding-right:10px;">

</td>
<td align="right">16#</td>
</tr>
</tbody></table>
<div id="content2621003196703169702" class="content"> x4long@163.com
<div class="fs-newline"></div> <div class="fs-newline"></div>男 <div class="fs-newline"></div> <div class="fs-newline"></div>想找一个聊天的好朋友
<div class="fs-newline"></div> <div class="fs-newline"></div>不是搞对象 <div class="fs-newline"></div> <div class="fs-newline"></div>本人平时一贯很低调
</div>
</div>

<div id="ReContent2622355336988423044" style="word-wrap: break-word;">
<table cellspacing="0" border="0" bgcolor="#F5F9FA" width="100%">
<tbody><tr>
<td width="206" valign="bottom" align="right"></td>
<td width="500" align="center"><font size="-1" color="green">
<font color="green" size="-1">作者:<a href="http://my.tianya.cn/13939472" class="tz_auto" target="_blank">tony_ly</a><span value="13939472" name="userid_13939472" style="float: none; display: inline;"></span>&nbsp;提交日期:2008-09-12 01:36:00&nbsp;</font>
</font></td>
<td width="206" align="right" style="padding-right:10px;">

</td

 

#region 从大家留下email交友吧_email_天涯社区.htm文件中提取Email

string html = File.ReadAllText("大家留下email交友吧_email_天涯社区.htm");
//提取组:1.在正则表达式中添加()来分组。2.通过Match对象的Groups集合来获取分组信息,注意Groups的索引0表示本次匹配到的字符串,从1开始才表示组的信息。

MatchCollection matches
= Regex.Matches(html, @"([-a-zA-Z0-9_.]+)@([-a-zA-Z0-9]+(\.[a-zA-Z]+){1,2})");
//正则表达式中的每个()都具有两重含义:1.改变优先级2.提取组。
foreach (Match item in matches)
{
if (item.Success)
{
//item.Value等同于item.Groups[0].Value,所以提取组的信息应该从Groups[1]开始
Console.WriteLine(item.Value + "\t" + item.Groups[1].Value + "\t" + item.Groups[2].Value);
}
}
Console.WriteLine(matches.Count);
Console.ReadKey();
#endregion

结果:正则表达式学习笔记

 

贪婪模式:

          贪婪模式:当出现限定符+、*、?、{n,}类似这样的限定符时,正则表达式默认会尽可能多的进行匹配,这种方式叫做:”贪婪模式“。 在”限定符“后加?就表是”终止贪婪模式“。”终止贪婪模式“意味着尽可能少的匹配。

#region 贪婪模式造成的问题
Console.WriteLine(
"默认贪婪模式下的结果");
string msg = "1111。11。111。111111。";
Match match
= Regex.Match(msg, ".+");
Console.WriteLine(match.Value);
Console.WriteLine(
"禁止贪婪模式下的结果");
string msg1 = "1111。11。111。111111。";
Match match1
= Regex.Match(msg1, ".+?");
Console.WriteLine(match1.Value);
Console.ReadKey();

#endregion

正则表达式学习笔记

多行模式:

反向引用:\1 \2 \3这种写法就表示反向引用,在字符串替换中引用分组是使用$,在正则表达式内部引用分组信息则用\1这种方

环视:

?=肯定正向环视,?!否定正向环视,?<=肯定逆向环视,?<!否定逆向环视。

(?<!\d)\d{5}(?!\d)表示数字前后都没有数字,中间有五位数字,记得加括号

案例:通过“环视”来实现,提取5位电话号码

string msg = "苏坤:18999141265蒋坤:13111111111杨中科:13488888888电信:10000移动:10086联通:10010工行:95588传智播客010-82935100传智播客:010-82935150"; 
MatchCollection matches
= Regex.Matches(msg, @"(?<!\d)\d{5}(?!\d)", RegexOptions.ECMAScript);
foreach (Match item in matches)
{
Console.WriteLine(item.Value);
//Console.WriteLine(item.Groups[1].Value);
}
Console.ReadKey();