Java 使用模式和匹配器类

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import java.util.regex.Pattern;/** 来 自 时   代     Java  公  众  号 - nowjava.com**/

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import java.util.regex.Matcher;

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public class Main {

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  public static void main(String[] args) {

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    String regex = "[abc]@.";

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    String source = "cric@mypkg.com is a valid email address";

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    Main.findPattern(regex, source);

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    source = "asdf@mypkg.com is invalid";

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    Main.findPattern(regex, source);

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    source = "a@asdf@fdsa@u";

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    Main.findPattern(regex, source);

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    source = "There is an @ sign here";

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    Main.findPattern(regex, source);

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  }

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  public static void findPattern(String regex, String source) {

  /*

  nowjava

  */

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    // Compile regex into a Pattern object

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    Pattern p = Pattern.compile(regex);

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    // Get a Matcher object

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    Matcher m = p.matcher(source);

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    boolean found = false ;

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    // Print regex and source text

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    System.out.println("\nRegex:" + regex);

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    System.out.println("Text:" + source);

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    // Perform find

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    while (m.find()) {

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      System.out.println("Matched Text:" + m.group() + ", Start:" + m.start() + ", " + 

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                         "End:" + m.end());

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