import java.util.regex.Matcher;

import java.util.regex.Pattern;

public class TestZhengZe {

public static void main(String[] args) {

//匹配数字

Pattern mac = Pattern.compile("-?(0|([1-9][0-9]*))(\\.[0-9]+)?");

System.out.println(mac.matcher("101.001").matches());

System.out.println(mac.matcher("-00.000").matches());

//截取字符串中的数字和将数字括起来

Pattern pattern = Pattern.compile("[0-9]+");

String s = "aa123cc001qwe";

StringBuilder newStr = new StringBuilder(s);

Matcher matcher = pattern.matcher(s);

int i = 0;

while(matcher.find()){

int start = matcher.start();

int end = matcher.end();

System.out.println(s.substring(start, end));

newStr.insert(start+i, '[');

newStr.insert(end+1+i, ']');

i = i + 2;

System.out.println(newStr.toString());

}

//替换指定的字符串

Pattern patt = Pattern.compile("[a-z]+");

String ss = "1321ase45212zxB11NBV1";

Matcher match = patt.matcher(ss);

ss = match.replaceAll("*");

System.out.println(ss);

//split分割字符串

Pattern pa = Pattern.compile("[A-Z]+");

String[] strArrays = pa.split("123ZAS321ZZ222");

for(String st:strArrays){

System.out.println(st);

}

}

}

结果：