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");
