package javaDemo;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class GetNumFromString {

	/**
	 * @songwenju
	 */
	public static void main(String[] args) {
      String str = "Java教程12.50";
      String regex =  "\\d*[.]\\d*";
      Pattern p = Pattern.compile(regex);

      Matcher m = p.matcher(str);

      while (m.find()) {
      if (!"".equals(m.group()))
    	  System.out.println("价格:" + m.group());
      }
	     
	}

}

java通过正则表达式获取文本中的浮点数