Java正则表达式，用于检查字符串是否包含字母
以下是匹配给定输入中的字母的正则表达式-
"^[a-zA-Z]*$"
哪里，
^匹配句子的开头。
[a-zA-z]匹配小写字母和大写字母。
*表示零次或多次。
＆表示行尾。
例子1
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class ContainsAlphabetExample {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
String names[] = new String[5];
for(int i=0; i<names.length;i++){
System.out.println("Enter your name: ");
names[i] = sc.nextLine();
}
//接受英文字母的正则表达式
String regex = "^[a-zA-Z]*$";
//创建一个模式对象
Pattern pattern = Pattern.compile(regex);
for (String name : names) {
//创建一个Matcher对象
Matcher matcher = pattern.matcher(name);
if(matcher.matches()) {
System.out.println(name+" is a valid name");
} else {
System.out.println(name+" is not a valid name");
}
}
}
}输出结果
Enter your name: krishna Enter your name: kasyap Enter your name: maruthi# Enter your name: Sai_Ram Enter your name: Vani.Viswanath krishna is a valid name kasyap is a valid name maruthi# is not a valid name Sai_Ram is not a valid name Vani.Viswanath is not a valid name
例子2
import java.util.Scanner;
public class Just {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.println("Enter your name: ");
String name = sc.nextLine();
String regex = "^[a-zA-Z]*$";
boolean result = name.matches(regex);
if(result) {
System.out.println("Given name is valid");
} else {
System.out.println("Given name is not valid");
}
}
}输出结果
Enter your name: vasu#dev Given name is not valid