如何从包含正则表达式模式的Java字符串中提取组
如何从包含正则表达式模式的Java字符串中提取组
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class RegexTest {
public static void main(String[] args) {
Pattern pattern = Pattern.compile("fun");
Matcher matcher = pattern.matcher("Java is fun");
// using Matcher find(), group(), start() and end() methods
while (matcher.find()) {
System.out.println("Found the text \"" + matcher.group()
+ "\" 开始 " + matcher.start()
+ " 索引并以索引结尾 " + matcher.end());
}
}
}使用Java正则表达式检查字符串是否包含数字。
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Numberornot {
public static void main(String[] args) {
String s;
System.out.println("enter string");
Scanner sc=new Scanner(System.in);
s = sc.nextLine();
System.out.println(isNumber(s));
}
public static boolean isNumber( String s ) {
Pattern p = Pattern.compile( "[0-9]" );
Matcher m = p.matcher( s );
return m.find();
}
}输出结果
enter string hello123 true
输出结果
enter string hello false