正则表达式的运用

package org.jimmy.autosearch20180821.test;

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

public class TestRegularExpression {

    public static void main(String[] args) {
        //2位数字直接匹配,3位或3位以上的数字直接匹配末尾两位数字
        Pattern pattern = Pattern.compile("d{2}(?!d+)");
        Matcher matcher = pattern.matcher("145423gdf4525243g89dgf56gxdfd123gxf4562gxd2357xgdf12gdsf36");
        while(matcher.find()){
            System.out.print(matcher.group() + " ");
        }
        System.out.println();
        //这个在之前基础上过滤掉了前面的数字(3位或3位以上的数字不会匹配,只会匹配2位数的数字)
        pattern = Pattern.compile("(?<!d+)d{2}(?!d+)");
        matcher = pattern.matcher("145423gdf4525243g89dgf56gxdfd123gxf4562gxd2357xgdf12gdsf36");
        while(matcher.find()){
            System.out.print(matcher.group() + " ");
        }
    }

}