C # Regular Expression match related string __ Regular expression

#正则表达式匹配字符串的方法如下:


1. Use regular expression System.Text.RegularExpressions namespaces in C #;


2. Use the regular expression matches () method in C # to match a string with the following format:
MatchCollection matches = regex.matches (Str, pattern, regexoptions.ignorecase | Regexoptions.explicitcapture);


Where str represents the input string, pattern represents the match mode, regexoptions.ignorecase indicates that the case is ignored, and Regexoptions.explicitcapture indicates that the collection matching method is changed.


3. The matching results are saved in the MatchCollection collection and can be iterated through the result set to remove the result of the match object.
TestRagular.cs:


Using System;
Using System.Text.RegularExpressions;

Namespace Magci.Test.Strings
{
public class Testregular
{
public static void Writematches (String str, matchcollection matches)
{
Console.WriteLine ("\nstring is:" + str);
Console.WriteLine ("No.") of matches: "+ matches." Count);
foreach (Match nextmatch in matches)
{
Take out a matching string and up to 10 peripheral characters
int Index = Nextmatch.index;
string result = Nextmatch.tostring ();
int charsbefore = (Index < 5)? Index:5;
int fromend = str. Length-index-result. Length;
int charsafter = (Fromend < 5)? Fromend:5;
int charstodisplay = Charsbefore + result. Length + charsafter;

Console.WriteLine ("Index: {0},\tstring: {1},\t{2}", index, result, str.) Substring (Index-charsbefore, Charstodisplay));
}
}

public static void Main ()
{
String Str = @ "My name is MAGCI, for short MGC." I like C sharp! ";

Look up "GC"
String pattern = "GC";
MatchCollection matches = regex.matches (Str, pattern, regexoptions.ignorecase | Regexoptions.explicitcapture);

Writematches (Str, matches);

Find words that start with "M" and End with "C"
Pattern = @ "\bm\s*c\b";
matches = regex.matches (Str, pattern, regexoptions.ignorecase | Regexoptions.explicitcapture);

Writematches (Str, matches);
}
}
}