C#正则表达式匹配字符串的方法如下:
1.使用C#中使用正则表达式System.Text.RegularExpressions命名空间;
2.使用C#中使用正则表达式Matches()方法匹配字符串,格式如下:
MatchCollection Matches = Regex.Matches(Str, Pattern, RegexOptions.IgnoreCase | RegexOptions.ExplicitCapture);
其中Str表示输入字符串,Pattern表示匹配模式,RegexOptions.IgnoreCase表示忽略大小写,RegexOptions.ExplicitCapture表示改变收集匹配方式。
3.匹配结果保存在MatchCollection集合中,可以通过循环遍历结果集取出Match对象的结果。
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)
{
//取出匹配字符串和最多10个外围字符
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!";
//查找“gc”
string Pattern = "gc";
MatchCollection Matches = Regex.Matches(Str, Pattern, RegexOptions.IgnoreCase | RegexOptions.ExplicitCapture);
WriteMatches(Str, Matches);
//查找以“m”开头,“c”结尾的单词
Pattern = @"\bm\S*c\b";
Matches = Regex.Matches(Str, Pattern, RegexOptions.IgnoreCase | RegexOptions.ExplicitCapture);
WriteMatches(Str, Matches);
}
}
}
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