- 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._%+-][email protected][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");
- }
- }
- }
来源: http://www.phpxs.com/code/1002688/