本文整理汇总了C#中System.Text.RegularExpressions.Regex类的典型用法代码示例。如果您正苦于以下问题：C# Regex类的具体用法？C# Regex怎么用？C# Regex使用的例子？那么恭喜您, 这里精选的类代码示例或许可以为您提供帮助。
Regex类属于System.Text.RegularExpressions命名空间，在下文中一共展示了Regex类的5个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C#代码示例。
示例1: Main
//引入命名空间
using System;
using System.Text.RegularExpressions;
public class Test
{
public static void Main ()
{
// Define a regular expression for repeated words.
Regex rx = new Regex(@"\b(?<word>\w+)\s+(\k<word>)\b",
RegexOptions.Compiled | RegexOptions.IgnoreCase);
// Define a test string.
string text = "The the quick brown fox fox jumps over the lazy dog dog.";
// Find matches.
MatchCollection matches = rx.Matches(text);
// Report the number of matches found.
Console.WriteLine("{0} matches found in:\n {1}",
matches.Count,
text);
// Report on each match.
foreach (Match match in matches)
{
GroupCollection groups = match.Groups;
Console.WriteLine("'{0}' repeated at positions {1} and {2}",
groups["word"].Value,
groups[0].Index,
groups[1].Index);
}
}
}
// The example produces the following output to the console:
// 3 matches found in:
// The the quick brown fox fox jumps over the lazy dog dog.
// 'The' repeated at positions 0 and 4
// 'fox' repeated at positions 20 and 25
// 'dog' repeated at positions 50 and 54示例2: Main
//引入命名空间
using System;
using System.Globalization;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
// Get the current NumberFormatInfo object to build the regular
// expression pattern dynamically.
NumberFormatInfo nfi = NumberFormatInfo.CurrentInfo;
// Define the regular expression pattern.
string pattern;
pattern = @"^\s*[";
// Get the positive and negative sign symbols.
pattern += Regex.Escape(nfi.PositiveSign + nfi.NegativeSign) + @"]?\s?";
// Get the currency symbol.
pattern += Regex.Escape(nfi.CurrencySymbol) + @"?\s?";
// Add integral digits to the pattern.
pattern += @"(\d*";
// Add the decimal separator.
pattern += Regex.Escape(nfi.CurrencyDecimalSeparator) + "?";
// Add the fractional digits.
pattern += @"\d{";
// Determine the number of fractional digits in currency values.
pattern += nfi.CurrencyDecimalDigits.ToString() + "}?){1}$";
Regex rgx = new Regex(pattern);
// Define some test strings.
string[] tests = { "-42", "19.99", "0.001", "100 USD",
".34", "0.34", "1,052.21", "$10.62",
"+1.43", "-$0.23" };
// Check each test string against the regular expression.
foreach (string test in tests)
{
if (rgx.IsMatch(test))
Console.WriteLine("{0} is a currency value.", test);
else
Console.WriteLine("{0} is not a currency value.", test);
}
}
}输出：
-42 is a currency value. 19.99 is a currency value. 0.001 is not a currency value. 100 USD is not a currency value. .34 is a currency value. 0.34 is a currency value. 1,052.21 is not a currency value. $10.62 is a currency value. +1.43 is a currency value. -$0.23 is a currency value.
示例3: StreamReader
StreamReader sr = new StreamReader(filename);
string input;
string pattern = @"\b(\w+)\s\1\b";
while (sr.Peek() >= 0)
{
input = sr.ReadLine();
Regex rgx = new Regex(pattern, RegexOptions.IgnoreCase);
MatchCollection matches = rgx.Matches(input);
if (matches.Count > 0)
{
Console.WriteLine("{0} ({1} matches):", input, matches.Count);
foreach (Match match in matches)
Console.WriteLine(" " + match.Value);
}
}
sr.Close();示例4: StreamReader
StreamReader sr = new StreamReader(filename);
string input;
string pattern = @"\b(\w+)\s\1\b";
Regex rgx = new Regex(pattern, RegexOptions.IgnoreCase);
while (sr.Peek() >= 0)
{
input = sr.ReadLine();
MatchCollection matches = rgx.Matches(input);
if (matches.Count > 0)
{
Console.WriteLine("{0} ({1} matches):", input, matches.Count);
foreach (Match match in matches)
Console.WriteLine(" " + match.Value);
}
}
sr.Close();示例5: new Regex(String pattern)
//引入命名空间
using System;
using System.Text.RegularExpressions;
class MainClass
{
public static void Main()
{
string s = "A, B,cCCC, D";
Regex regex = new Regex(@" |, ");
foreach (string sub in regex.Split(s))
{
Console.WriteLine("Word: {0}", sub);
}
}
}