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To better understand how to use regular expressions in the C # environment, I have written some regular expressions that may be useful to you. These expressions have been used in other environments, hope to help you.
Roman numerals
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 );
Exchange the 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 );
Guan jianzi = Value
String t3 = "myval = 3 ";
String p3 = @ "(\ w +) \ s * = \ s * (. *) \ s * $ ";
Match m3 = Regex. Match (t3, p3 );
Implement 80 characters per line
String t4 = "********************"
+ "******************************"
+ "******************************";
String p4 = ". {80 ,}";
Match m4 = Regex. Match (t4, p4 );
Month/day/year hour: minute: Second Time Format
String t5 = "01/01/01 16:10:01 ";
String p5 = @ "(\ d +)/(\ d +) :( \ d + )";
Match m5 = Regex. Match (t5, p5 );
Change directory (applicable only to Windows)
String t6 = @ "C: \ Documents ents and Settings \ user1 \ Desktop \";
String r6 = Regex. Replace (t6, @ "\ user1 \", @ "\ user2 \\");
Extended 16-bit escape characters
String t7 = "% 41"; // capital
String p7 = "% ([0-9A-Fa-f] [0-9A-Fa-f])";
String r7 = Regex. Replace (t7, p7, HexConvert );
Delete comments in C Language (to be improved)
String t8 = @"
/*
* Notes for traditional styles
*/
";
String p8 = @"
/\ * # Match the delimiters starting with the Annotation
.*? # Matching comments
\ */# End Separator of matching Annotation
";
String r8 = Regex. Replace (t8, p8, "", "xs ");
Deletes spaces at the start and end of a string.
String t9a = "leading ";
String p9a = @ "^ \ s + ";
String r9a = Regex. Replace (t9a, p9a ,"");
String t9b = "trailing ";
String p9b = @ "\ s + $ ";
String r9b = Regex. Replace (t9b, p9b ,"");
Add character n after character \ to make it a real New Line
String t10 = @ "\ ntest \ n ";
String r10 = Regex. Replace (t10, @ "\ n", "\ n ");
Convert IP addresses
String t11 = "55.54.53.52 ";
String p11 = "^" +
@ "([01]? \ D | 2 [0-4] \ d | 25 [0-5]) \. "+
@ "([01]? \ D | 2 [0-4] \ d | 25 [0-5]) \. "+
@ "([01]? \ D | 2 [0-4] \ d | 25 [0-5]) \. "+
@ "([01]? \ D | 2 [0-4] \ d | 25 [0-5]) "+
"$ ";
Match m11 = Regex. Match (t11, p11 );
Delete the path contained in the file name
String t12 = @ "c: \ file.txt ";
String p12 = @ "^ .*\\";
String r12 = Regex. Replace (t12, p12 ,"");
Concatenate rows from multiple strings
String t13 = @ "this is
A split line ";
String p13 = @ "\ s * \ r? \ N \ s *";
String r13 = Regex. Replace (t13, p13 ,"");
Extract all numbers in the string
String t14 = @"
Test 1
Test 1, 2.3
Test 47
";
String p14 = @ "(\ d + \.? \ D * | \. \ d + )";
MatchCollection mc14 = Regex. Matches (t14, p14 );
Find all uppercase letters
String t15 = "This IS a Test of all Caps ";
String p15 = @ "(\ B [^ \ Wa-z0-9 _] + \ B )";
MatchCollection mc15 = Regex. Matches (t15, p15 );
Find lowercase words
String t16 = "This is A Test of lowercase ";
String p16 = @ "(\ B [^ \ WA-Z0-9 _] + \ B )";
MatchCollection mc16 = Regex. Matches (t16, p16 );
Find the words whose first letter is uppercase.
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 );
Find links in a simple HTML language
String t18 = @"
<Html>
<A href = "" first.htm ""> first tag text </a>
<A href = "" next.htm ""> next tag text </a>
</Html>
";
String p18 = @ "<A [^>] *? HREF \ s * = \ s * ["" ']? "+ @" ([^ '">] + ?) ['""]?> ";
MatchCollection mc18 = Regex. Matches (t18, p18, "si ");
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