为了能够更好地理解如何在C#环境中使用正则表达式，我写出一些对你来说可能有用的正则表达式，这些表达式在其他的环境中都被使用过，希望能够对你有所帮助。
罗马数字
string p1 = "^m*(d?c{0,3}|c[dm])" + "(l?x{0,3}|x[lc])(v?i{0,3}|i[vx])$";
string t1 = "vii";
Match m1 = Regex.Match(t1, p1);
交换前二个单词
string t2 = "the quick brown fox";
string p2 = @"(S+)(s+)(S+)";
Regex x2 = new Regex(p2);
string r2 = x2.Replace(t2, "$3$2$1", 1);
关健字=值
string t3 = "myval = 3";
string p3 = @"(w+)s*=s*(.*)s*$";
Match m3 = Regex.Match(t3, p3);
实现每行80个字符
string t4 = "********************"
+ "******************************"
+ "******************************";
string p4 = ".{80,}";
Match m4 = Regex.Match(t4, p4);
月/日/年 小时:分:秒的时间格式
string t5 = "01/01/01 16:10:01";
string p5 = @"(d+)/(d+)/(d+) (d+):(d+):(d+)";
Match m5 = Regex.Match(t5, p5);
改变目录（仅适用于Windows平台）
string t6 = @"C:documents and Settingsuser1Desktop";
string r6 = Regex.Replace(t6,@"\user1\", @"\user2\");
扩展16位转义符
string t7 = "%41"; // capital A
string p7 = "%([0-9A-Fa-f][0-9A-Fa-f])";
string r7 = Regex.Replace(t7, p7, HexConvert);
删除C语言中的注释（有待完善）
string t8 = @"
";
string p8 = @"
# 匹配注释结束定界符
";
string r8 = Regex.Replace(t8, p8, "", "xs");
删除字符串中开始和结束处的空格
string t9a = " leading";
string p9a = @"^s+";
string r9a = Regex.Replace(t9a, p9a, "");
string t9b = "trailing ";
string p9b = @"s+$";
string r9b = Regex.Replace(t9b, p9b, "");
在字符后添加字符n，使之成为真正的新行
string t10 = @"ntestn";
string r10 = Regex.Replace(t10, @"\n", "n");
转换IP地址
string t11 = "55.54.53.52";
string p11 = "^" +
@"([01]?dd|2[0-4]d|25[0-5])." +
@"([01]?dd|2[0-4]d|25[0-5])." +
@"([01]?dd|2[0-4]d|25[0-5])." +
@"([01]?dd|2[0-4]d|25[0-5])" +
"$";
Match m11 = Regex.Match(t11, p11);
删除文件名包含的路径
string t12 = @"c:file.txt";
string p12 = @"^.*\";
string r12 = Regex.Replace(t12, p12, "");
联接多行字符串中的行
string t13 = @"this is
a split line";
string p13 = @"s*r?ns*";
string r13 = Regex.Replace(t13, p13, " ");
提取字符串中的所有数字
string t14 = @"
test 1
test 2.3
test 47
";
string p14 = @"(d+.?d*|.d+)";
MatchCollection mc14 = Regex.Matches(t14, p14);
找出所有的大写字母
string t15 = "This IS a Test OF ALL Caps";
string p15 = @"(b[^Wa-z0-9_]+b)";
MatchCollection mc15 = Regex.Matches(t15, p15);
找出小写的单词
string t16 = "This is A Test of lowercase";
string p16 = @"(b[^WA-Z0-9_]+b)";
MatchCollection mc16 = Regex.Matches(t16, p16);
找出第一个字母为大写的单词
string t17 = "This is A Test of Initial Caps";
string p17 = @"(b[^Wa-z0-9_][^WA-Z0-9_]*b)";
MatchCollection mc17 = Regex.Matches(t17, p17);
找出简单的HTML语言中的链接
string t18 = @"
first tag text
next tag text
";
string p18 = @"]*?HREFs*=s*[""']?" + @"([^'"" >]+?)[ '""]?>";
MatchCollection mc18 = Regex.Matches(t18, p18, "si");
