someoftheregularexpressionslistedinthePerlCookBook
someoftheregularexpressionslistedinthePerlCookBook
/* * 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 = "A"; 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; } } (2005-8-09:05:37)
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