Java中的模式quote()方法及示例
java的java.util.regex包提供了各种类来查找字符序列中的特定模式。
该程序包的模式类是正则表达式的编译表示。此类的quote()方法接受字符串值，并返回与给定字符串匹配的模式字符串，即向给定字符串添加其他元字符和转义序列。无论如何，给定字符串的含义不受影响。
例子1
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class QuoteExample {
public static void main( String args[] ) {
//读取字符串值
Scanner sc = new Scanner(System.in);
System.out.println("Enter input string");
String input = sc.nextLine();
System.out.print("Enter the string to be searched: ");
String regex = Pattern.quote(sc.nextLine());
System.out.println("pattern string: "+regex);
//编译正则表达式
Pattern pattern = Pattern.compile(regex);
//检索Matcher对象
Matcher matcher = pattern.matcher(input);
if(matcher.find()) {
System.out.println("Match found");
} else {
System.out.println("Match not found");
}
}
}输出结果
Enter input string This is an example program demonstrating the quote() method Enter the string to be searched: the pattern string: \Qthe\E Match found
例子2
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class QuoteExample {
public static void main( String args[] ) {
String regex = "[aeiou]";
String input = "Hello how are you welcome to Nhooo";
//编译正则表达式
Pattern.compile(regex);
regex = Pattern.quote(regex);
System.out.println("pattern string: "+regex);
//编译正则表达式
Pattern pattern = Pattern.compile(regex);
Matcher matcher = pattern.matcher(input);
if(matcher.find()) {
System.out.println("The input string contains vowels");
} else {
System.out.println("The input string does not contain vowels");
}
}
}输出结果
pattern string: \Q[aeiou]\E The input string contains vowels