正则表达式提取 Email 地址，正则表达式email,RegularExpre

正则表达式提取 Email 地址，正则表达式email,RegularExpre

RegularExpression.java

import java.util.regex.Matcher;import java.util.regex.Pattern;import java.io.BufferedReader;import java.io.File;import java.io.FileReader;import java.io.IOException;public class RegularExpression {    public static void main(String[] args) throws IOException {        // Simple expression to find a valid e-mail address in a file        Pattern pattern = Pattern.compile("[A-Z0-9._%+-]+@[A-Z0-9.-]+\\.[A-Z]{2,4}");        // Read file, find valid mail addresses and print result        File file = new File("test.txt");        BufferedReader in = new BufferedReader(new FileReader(file));        int lines = 0;        int matches = 0;        for (String line = in.readLine(); line != null; line = in.readLine()) {            lines++;            Matcher matcher = pattern.matcher(line.toUpperCase());            if (matcher.matches()) {                    System.out.println(lines + ": '" + line + "'");                matches++;            }        }        // output of summary        if (matches == 0) {                System.out.println("No matches in " + lines + " lines");        } else {            System.out.println("\n" + matches + " matches in " + lines + " lines");        }    }}

Test.txt

markus.sprunck@markus.sprunck@online.demarkus.sprunck@sampledomain.eumarkus.sprunck@online@online.de

运行结果

2: 'markus.sprunck@online.de'3: 'markus.sprunck@sampledomain.eu'2 matches in 6 lines