/*

* This is a conversion of some of the regular expressions listed in

* the Perl CookBook.

* compile this sample with the command line:

* csc /debug /r:System.Text.RegularExpressions.dll cookbook.cs

* This has been tested with Beta1 of the Framework SDK.

*/

using System.Text.RegularExpressions;

using System;

class Test

{

static void Main()

{

// Roman Numbers

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);

Console.WriteLine("Match=[" + m1 + "]");

// Swap first two words

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);

Console.WriteLine("Result=[" + r2 + "]");

// Keyword = Value

string t3 = "myval = 3";

string p3 = @"(\w+)\s*=\s*(.*)\s*$";

Match m3 = Regex.Match(t3, p3);

Console.WriteLine("Group1=[" + m1.Group(1) + "]");

Console.WriteLine("Group2=[" + m1.Group(2) + "]");

// Line of at least 80 chars

string t4 = "********************"

+ "******************************"

+ "******************************";

string p4 = ".{80,}";

Match m4 = Regex.Match(t4, p4);

Console.WriteLine("if line >= 80 is = " + m1.Success + "]");

// MM/DD/YY HH:MM:SS

string t5 = "01/01/01 16:10:01";

string p5 = @"(\d+)/(\d+)/(\d+) (\d+):(\d+):(\d+)";

Match m5 = Regex.Match(t5, p5);

Console.WriteLine("M5=" + m5);

for (int i = 1; i <= 6; i++)

Console.WriteLine("Group" + i + "=[" + m5.Group(i) + "]");

// Changing directories (for Windows)

string t6 = @"C:\Documents and Settings\user1\Desktop\";

string r6 = Regex.Replace(t6, @"\\user1\\", @"\\user2\\"); // ";

// expanding (%nn) hex escapes

string t7 = "%41";

string p7 = "%([0-9A-Fa-f][0-9A-Fa-f])";

string r7 = Regex.Replace(t7, p7, HexConvert);

Console.WriteLine("R7=" + r7);

// deleting C comments (imperfectly)

string t8 = @"

/*

* this is an old cstyle comment block

*/

foo();

";

string p8 = @"

/\* # match the opening delimiter

.*? # match a minimal numer of chracters

\*/ # match the closing delimiter

";

string r8 = Regex.Replace(t8, p8, "", "xs");

Console.WriteLine("r8="+r8);

// Removing leading and trailing whitespace

string t9a = " leading";

string p9a = @"^\s+";

string r9a = Regex.Replace(t9a, p9a, "");

Console.WriteLine("r9b=" + r9a);

string t9b = "trailing ";

string p9b = @"\s+$";

string r9b = Regex.Replace(t9b, p9b, "");

Console.WriteLine("r9b=" + r9b);

// turning \ followed by n into a real newline

string t10 = @"\ntest\n";

string r10 = Regex.Replace(t10, @"\\n", "\n");

Console.WriteLine("r10=" + r10);

// IP address

string t11 = "55.54.53.52";

string p11 = "^" +

@"([01]?\d\d|2[0-4]\d|25[0-5])\." +

@"([01]?\d\d|2[0-4]\d|25[0-5])\." +

@"([01]?\d\d|2[0-4]\d|25[0-5])\." +

@"([01]?\d\d|2[0-4]\d|25[0-5])" +

"$";

Match m11 = Regex.Match(t11, p11);

Console.WriteLine("M11=" + m11);

Console.WriteLine("Group1=" + m11.Group(1));

Console.WriteLine("Group2=" + m11.Group(2));

Console.WriteLine("Group3=" + m11.Group(3));

Console.WriteLine("Group4=" + m11.Group(4));

// removing leading path from filename

string t12 = @"c:\file.txt";

string p12 = @"^.*\\";

string r12 = Regex.Replace(t12, p12, "");

Console.WriteLine("r12=" + r12);

// joining lines in multiline strings

string t13 = @"this is

a split line";

string p13 = @"\s*\r?\n\s*";

string r13 = Regex.Replace(t13, p13, " ");

Console.WriteLine("r13=" + r13);

// extracting all numbers from a string

string t14 = @"

test 1

test 2.3

test 47

";

string p14 = @"(\d+\.?\d*|\.\d+)";

MatchCollection mc14 = Regex.Matches(t14, p14);

foreach (Match m in mc14)

Console.WriteLine("Match=" + m);

// finding all caps words

string t15 = "This IS a Test OF ALL Caps";

string p15 = @"(\b[^\Wa-z0-9_]+\b)";

MatchCollection mc15 = Regex.Matches(t15, p15);

foreach (Match m in mc15)

Console.WriteLine("Match=" + m);

// find all lowercase words

string t16 = "This is A Test of lowercase";

string p16 = @"(\b[^\WA-Z0-9_]+\b)";

MatchCollection mc16 = Regex.Matches(t16, p16);

foreach (Match m in mc16)

Console.WriteLine("Match=" + m);

// find all initial caps

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);

foreach (Match m in mc17)

Console.WriteLine("Match=" + m);

// find links in simple HTML

string t18 = @"

first tag text

next tag text

";

string p18 = @"]*?HREF\s*=\s*[""']?([^'"" >]+?)[ '""]?>";

MatchCollection mc18 = Regex.Matches(t18, p18, "si");

foreach (Match m in mc18)

{

Console.WriteLine("Match=" + m);

Console.WriteLine("Group1=" + m.Group(1));

}

// finding middle initial

string t19 = "Hanley A. Strappman";

string p19 = @"^\S+\s+(\S)\S*\s+\S";

Match m19 = Regex.Match(t19, p19);

Console.WriteLine("Initial=" + m19.Group(1));

// changing inch marks to quotes

string t20 = @"2' 2"" ";

string p20 = "\"([^\"]*)";

string r20 = Regex.Replace(t20, p20, "``$1''");

Console.WriteLine("Result=" + r20);

}

static int[] hexval = new int[128];

static Test()

{

InitHex();

}

static void InitHex()

{

hexval['0'] = 0;

hexval['1'] = 1;

hexval['2'] = 2;

hexval['3'] = 3;

hexval['4'] = 4;

hexval['5'] = 5;

hexval['6'] = 6;

hexval['7'] = 7;

hexval['8'] = 8;

hexval['9'] = 9;

hexval['A'] = 10;

hexval['B'] = 11;

hexval['C'] = 12;

hexval['D'] = 13;

hexval['E'] = 14;

hexval['F'] = 15;

hexval['a'] = 10;

hexval['b'] = 11;

hexval['c'] = 12;

hexval['d'] = 13;

hexval['e'] = 14;

hexval['f'] = 15;

}

static MatchEvaluator HexConvert = new MatchEvaluator(Hex);

static string Hex(Match m)

{

string s = m.Group(1).ToString();

int i0 = hexval[s[0]];

int i1 = hexval[s[1]];

string r = new string((char)((i0 << 4) | i1),1);

return r;

}

}