Java、C#、Oracle和VB6中常用的通配符和模式匹配方式的详细说明和示例
发布人:shili8
发布时间:2024-08-09 01:31
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**Java 中的通配符和模式匹配**
在 Java 中,通配符和模式匹配是使用正则表达式(Regular Expression)实现的。Java 提供了 `java.util.regex` 包来支持正则表达式。
### 通配符Java 中的通配符包括:
* `d`: 匹配数字* `D`: 匹配非数字* `w`: 匹配字母、数字和下划线* `W`: 匹配非字母、数字和下划线* `s`: 匹配空白字符(包括空格、制表符等)
* `S`: 匹配非空白字符### 模式匹配Java 中的模式匹配可以使用 `Pattern` 和 `Matcher` 类来实现。以下是示例:
javaimport java.util.regex.Matcher; import java.util.regex.Pattern; public class PatternExample { public static void main(String[] args) { // 匹配数字 String str = "123456"; Pattern pattern = Pattern.compile("d"); Matcher matcher = pattern.matcher(str); while (matcher.find()) { System.out.println(matcher.group()); } // 匹配非数字 str = "abc123"; pattern = Pattern.compile("D"); matcher = pattern.matcher(str); while (matcher.find()) { System.out.println(matcher.group()); } // 匹配字母、数字和下划线 str = "hello_world"; pattern = Pattern.compile("w"); matcher = pattern.matcher(str); while (matcher.find()) { System.out.println(matcher.group()); } // 匹配非字母、数字和下划线 str = "!@#$%^&*()"; pattern = Pattern.compile("W"); matcher = pattern.matcher(str); while (matcher.find()) { System.out.println(matcher.group()); } // 匹配空白字符 str = " hello "; pattern = Pattern.compile("s"); matcher = pattern.matcher(str); while (matcher.find()) { System.out.println(matcher.group()); } // 匹配非空白字符 str = "!@#$%^&*()"; pattern = Pattern.compile("S"); matcher = pattern.matcher(str); while (matcher.find()) { System.out.println(matcher.group()); } } }
### 正则表达式Java 中的正则表达式可以使用 `Pattern` 类来实现。以下是示例:
javaimport java.util.regex.Matcher; import java.util.regex.Pattern; public class RegexExample { public static void main(String[] args) { // 匹配数字 String str = "123456"; Pattern pattern = Pattern.compile("d+"); Matcher matcher = pattern.matcher(str); while (matcher.find()) { System.out.println(matcher.group()); } // 匹配非数字 str = "abc123"; pattern = Pattern.compile("D+"); matcher = pattern.matcher(str); while (matcher.find()) { System.out.println(matcher.group()); } // 匹配字母、数字和下划线 str = "hello_world"; pattern = Pattern.compile("w+"); matcher = pattern.matcher(str); while (matcher.find()) { System.out.println(matcher.group()); } // 匹配非字母、数字和下划线 str = "!@#$%^&*()"; pattern = Pattern.compile("W+"); matcher = pattern.matcher(str); while (matcher.find()) { System.out.println(matcher.group()); } // 匹配空白字符 str = " hello "; pattern = Pattern.compile("s+"); matcher = pattern.matcher(str); while (matcher.find()) { System.out.println(matcher.group()); } // 匹配非空白字符 str = "!@#$%^&*()"; pattern = Pattern.compile("S+"); matcher = pattern.matcher(str); while (matcher.find()) { System.out.println(matcher.group()); } } }
### 模式匹配Java 中的模式匹配可以使用 `Matcher` 类来实现。以下是示例:
javaimport java.util.regex.Matcher; import java.util.regex.Pattern; public class MatcherExample { public static void main(String[] args) { // 匹配数字 String str = "123456"; Pattern pattern = Pattern.compile("d+"); Matcher matcher = pattern.matcher(str); while (matcher.find()) { System.out.println(matcher.group()); } // 匹配非数字 str = "abc123"; pattern = Pattern.compile("D+"); matcher = pattern.matcher(str); while (matcher.find()) { System.out.println(matcher.group()); } // 匹配字母、数字和下划线 str = "hello_world"; pattern = Pattern.compile("w+"); matcher = pattern.matcher(str); while (matcher.find()) { System.out.println(matcher.group()); } // 匹配非字母、数字和下划线 str = "!@#$%^&*()"; pattern = Pattern.compile("W+"); matcher = pattern.matcher(str); while (matcher.find()) { System.out.println(matcher.group()); } // 匹配空白字符 str = " hello "; pattern = Pattern.compile("s+"); matcher = pattern.matcher(str); while (matcher.find()) { System.out.println(matcher.group()); } // 匹配非空白字符 str = "!@#$%^&*()"; pattern = Pattern.compile("S+"); matcher = pattern.matcher(str); while (matcher.find()) { System.out.println(matcher.group()); } } }
**C# 中的通配符和模式匹配**
在 C# 中,通配符和模式匹配是使用正则表达式(Regular Expression)实现的。C# 提供了 `System.Text.RegularExpressions` 名称空间来支持正则表达式。
### 通配符C# 中的通配符包括:
* `d`: 匹配数字* `D`: 匹配非数字* `w`: 匹配字母、数字和下划线* `W`: 匹配非字母、数字和下划线* `s`: 匹配空白字符(包括空格、制表符等)
* `S`: 匹配非空白字符### 模式匹配C# 中的模式匹配可以使用 `Regex` 类来实现。以下是示例:
csharpusing System.Text.RegularExpressions; class RegexExample { static void Main() { // 匹配数字 string str = "123456"; Regex regex = new Regex("d+"); MatchCollection matches = regex.Matches(str); foreach (Match match in matches) { Console.WriteLine(match.Value); } // 匹配非数字 str = "abc123"; regex = new Regex("D+"); matches = regex.Matches(str); foreach (Match match in matches) { Console.WriteLine(match.Value); } // 匹配字母、数字和下划线 str = "hello_world"; regex = new Regex("w+"); matches = regex.Matches(str); foreach (Match match in matches) { Console.WriteLine(match.Value); } // 匹配非字母、数字和下划线 str = "!@#$%^&*()"; regex = new Regex("W+"); matches = regex.Matches(str); foreach (Match match in matches) { Console.WriteLine(match.Value); } // 匹配空白字符 str = " hello "; regex = new Regex("s+"); matches = regex.Matches(str); foreach (Match match in matches) { Console.WriteLine(match.Value); } // 匹配非空白字符 str = "!@#$%^&*()"; regex = new Regex("S+"); matches = regex.Matches(str); foreach (Match match in matches) { Console.WriteLine(match.Value); } } }
### 正则表达式C# 中的正则表达式可以使用 `Regex` 类来实现。以下是示例:
csharpusing System.Text.RegularExpressions; class RegexExample { static void Main() { // 匹配数字 string str = "123456"; Regex regex = new Regex("d+"); MatchCollection matches = regex.Matches(str); foreach (Match match in matches) { Console.WriteLine(match.Value); } // 匹配非数字 str = "abc123"; regex = new Regex("D+"); matches = regex.Matches(str); foreach (Match match in matches) { Console.WriteLine(match.Value); } // 匹配字母、数字和下划线 str = "hello_world"; regex = new Regex("w+"); matches = regex.Matches(str); foreach (Match match in