如何用正则表达式验证字符串:
String s = "2011\10\19"; 格式是否合法?java中用\\\\表示一个\字符 为什么这样写验证规则:
String pat = "\\d{4}\\\\\\d{2}\\\\\\d{2}"; 运行不正确
String s = "2011\10\19"; 格式是否合法?java中用\\\\表示一个\字符 为什么这样写验证规则:
String pat = "\\d{4}\\\\\\d{2}\\\\\\d{2}"; 运行不正确
String s = "2011\10\19"需要写成String s = "2011\\10\\19"才可以
import java.util.regex.Matcher;
import java.util.regex.Pattern;public class TestRegex {
public static void main(String[] args) {
String s = null;
Matcher matcher = null;
String pat = "\\d{4}\\\\\\d{2}\\\\\\d{2}";
Pattern pattern = Pattern.compile(pat); s = "2011\10\19";
matcher = pattern.matcher(s);
while (matcher.find()) {
System.out.println(matcher.group());
} s = "2011\\10\\19";
matcher = pattern.matcher(s);
while (matcher.find()) {
System.out.println(matcher.group());
}
}
}