Java 初识正则

Pattern类 

import java.util.regex.Pattern;
Pattern p = Pattern.compile("\\d+\\.\\d+");

import java.util.regex.Pattern;
boolean bl = Pattern.matches("[a]", "abc");
System.out.println(bl);

 

 

Matcher类

import java.util.regex.Matcher;
import java.util.regex.Pattern;
        
Pattern p = Pattern.compile("\\d+\\.\\d+");

Matcher m = p.matcher("3.14"); 
boolean b = m.matches();
System.out.println(b);