C#で正規表現を使う (IsMatch/Match)

2020-03-252021-03-14

正規表現のテストに便利なサイト

• Online regex tester and debugger: PHP, PCRE, Python, Golang and JavaScript
• Rubular: a Ruby regular expression editor

IsMatch

string strTarget = @"本日は閉店なり";

if(Regex.IsMatch(strTarget, @"(.+?)は(.+?)なり$"))
{
    Console.WriteLine("IsMatch : Match!!");
}

IsMatch : Match!!

Match

string strTarget = @"本日は閉店なり";

Match objMatch = Regex.Match(strTarget, @"(.+?)は(.+?)なり$");
if (objMatch.Success)
{
    Console.WriteLine("Groups[1] : " + objMatch.Groups[1].Value);
    Console.WriteLine("Groups[2] : " + objMatch.Groups[2].Value);
}

Groups[1] : 本日
Groups[2] : 閉店

Match (グループ名指定)

string strTarget = @"本日は閉店なり";

Match objMatchGroup = Regex.Match(strTarget, @"(?<day>.+?)は(?<action>.+?)なり$");
if (objMatchGroup.Success)
{
    Console.WriteLine("Groups[day] : " + objMatchGroup.Groups["day"].Value);
    Console.WriteLine("Groups[action] : " + objMatchGroup.Groups["action"].Value);
}

Groups[day] : 本日
Groups[action] : 閉店

複数件マッチさせる場合

string strTarget = @"本日は閉店なり。明日は開店なり。";

Match objMatchGroup = Regex.Match(strTarget, @"(?<day>.+?)は(?<action>.+?)なり。");

while (objMatchGroup.Success) {
    Console.WriteLine("Groups[day] : " + objMatchGroup.Groups["day"].Value);
    Console.WriteLine("Groups[action] : " + objMatchGroup.Groups["action"].Value);

    objMatchGroup = objMatchGroup.NextMatch();
}

Groups[day] : 本日
Groups[action] : 閉店
Groups[day] : 明日
Groups[action] : 開店