正则表达式（Java，C#，C++）

来源：互联网发布：软件测试的基本原则编辑：程序博客网时间：2024/06/05 18:47

课题

使用正则表达式匹配字符串
使用正则表达式 “\d{3}-(\d{4})-\d{2}” 匹配字符串 “123-4567-89”
返回匹配结果：’”123-4567-89” 以及 “4567”
使用正则表达式替换字符串
使用正则表达式 “\d+” 匹配字符串 “123-4567-89”
将匹配结果即三个数字串全部翻转过来，返回结果 “321-7654-98”。
使用正则表达式分割字符串
使用正则表达式 “%(begin|next|end)%” 分割字符串”%begin%hello%next%world%end%”
返回正则表达式分隔符之间的两个字符串 “hello” 和 “world”。

Java

import java.util.Arrays;import java.util.regex.Matcher;import java.util.regex.Pattern;public class Test {    public static void main(String[] args) {        String s = "123-4567-89";        Pattern r = Pattern.compile("\\d{3}-(\\d{4})-\\d{2}");        Matcher m = r.matcher(s);        if (m.find())            for (int i = 0; i <= m.groupCount(); i++)                System.out.printf("group %d : %s\n", i, m.group(i));        // https://stackoverflow.com/questions/19737653/what-is-the-equivalent-of-regex-replace-with-function-evaluation-in-java-7        r = Pattern.compile("\\d+");        m = r.matcher(s);        StringBuffer sb = new StringBuffer();        while (m.find())            m.appendReplacement(sb, new StringBuffer(m.group(0)).reverse().toString());        m.appendTail(sb);        System.out.println(sb.toString());        r = Pattern.compile("%(begin|next|end)%");        s = "%begin%hello%next%world%end%";        System.out.println(Arrays.asList(r.split(s)));    }}/*group 0 : 123-4567-89group 1 : 4567321-7654-98[, hello, world] */

C#

using System;using System.Text.RegularExpressions;namespace Sample{    class Test    {        public static void Main(string[] args)        {            var r = new Regex(@"\d{3}-(\d{4})-\d{2}");            var s = "123-4567-89";            var m = r.Match(s);            foreach (Group g in m.Groups)                Console.WriteLine($"group {g.Index} : {g.Value}");            r = new Regex(@"\d+");            s = r.Replace(s, m2 => {                var arr = m2.Groups[0].Value.ToCharArray();                Array.Reverse(arr);                return new string(arr);            });            Console.WriteLine(s);            r = new Regex("%(?:begin|next|end)%");            s = "%begin%hello%next%world%end%";            Console.WriteLine(String.Join(",", r.Split(s)));        }    }}/*group 0 : 123-4567-89group 4 : 4567321-7654-98,hello,world,*/

C++

#include <iostream>#include <string>#include <vector>#include <boost/regex.hpp>#include <boost/algorithm/string.hpp>using namespace std;int main(){    string s = "123-4567-89";    boost::regex r(R"(\d{3}-(\d{4})-\d{2})");    boost::match_results<string::const_iterator> mr;    boost::regex_search(s, mr, r);    for (size_t i = 0; i < mr.size(); ++i)        cout << "group " << i << " : " << mr[i] << endl;    boost::regex r2(R"(\d+)");    s = boost::regex_replace(s, r2, [](auto& match) {        string s = match.str();        reverse(s.begin(), s.end());        return s;    });    cout << s << endl;    boost::regex r3("%(?:begin|next|end)%");    s = "%begin%hello%next%world%end%";    vector<string> v;    for (boost::sregex_token_iterator begin(s.begin(), s.end(), r3, -1), end, i = begin; i != end; ++i)        v.push_back(i->str());    cout << boost::algorithm::join(v, ",") << endl;}/*group 0 : 123-4567-89group 1 : 4567321-7654-98,hello,world*/

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