package regularexp;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

public class RegUsages {
    // 验证例子

    private static boolean verify(String code) {

        final String patternStr = "\\d+";

        return Pattern.matches(patternStr, code);

    }

    // 查找例子

    private static void search() {

        Pattern pattern = Pattern.compile("m(o+)n", Pattern.CASE_INSENSITIVE);

        Matcher matcher=pattern.matcher("Sun Earth moon mooon Mon mooooon Mooon Mars");

        while(matcher.find()) {

            System.out.println(String.format("%s (%d~%d)", matcher.group(0),matcher.start(),matcher.end()));

        }

    }

    // 更替例子1

    private static void replace1() {

        String str = "10元 1000人民币 10000元 100000RMB";

        str = str.replaceAll("(\\d+)(元|人民币|RMB)", "$1圆");

        System.out.println(str);

    }

    // 更替例子2

    private static void replace2() {

        Pattern p = Pattern.compile("m(o+)n", Pattern.CASE_INSENSITIVE);

        Matcher m = p.matcher("Sun Earth moon mooon Mon mooooon Mooon Mars");

        StringBuffer sb = new StringBuffer();

        boolean result = m.find();

        while (result) {

            m.appendReplacement(sb, "Moon");

            result = m.find();

        }

        m.appendTail(sb);

        System.out.println("Result=" + sb.toString());

    }

    public static void main(String[] args) {

        System.out.println(String.format("601857 %s a stock code.",verify("601857")?"is":"isn't"));

        search();

        replace1();

        replace2();

    }

}

601857 is a stock code.

moon (10~14)

mooon (15~20)

Mon (21~24)

mooooon (25~32)

Mooon (33~38)

10圆 1000圆 10000圆 100000圆

Result=Sun Earth Moon Moon Moon Moon Moon Mars