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 = @"
<html>
<a href=""first.htm"">first tag text</a>
<a href=""next.htm"">next tag text</a>
</html>
";
string p18 = @"<A[^>]*?HREFs*=s*[""']?" + @"([^'"" >]+?)[ '""]?>";
MatchCollection mc18 = Regex.Matches(t18, p18, "si");
以上所述是小编给大家分享的C# replace在正则表达式中的意义，希望对大家有所帮助！
注：相关教程知识阅读请移步到c#教程频道。
