C# - 文字列(Regexクラス(正規表現), StringBuilderクラス)

初めてのC# 第2版
Jesse Liberty (著) Brian MacDonald (著)
日向俊二 (訳)
原書: Learning C# 2005

開発環境

• Microsoft Windows 8 Pro 64bit 日本語 (OS)
• Microsoft Visual Studio Express 2012 for Windows Desktop (IDE)
• プログラミング言語: C#

『初めてのC# 第2版』(Jesse Liberty+Brian MacDonald著、日向俊二訳、オライリー・ジャパン、2006年、ISBN978-487312-194-7)の 第15章(文字列)15.6(練習問題)練習15-2を解いてみる。

その他参考書籍

• プログラミングC# 第6版

練習15-2.

コード

using System;
using System.Text;
using System.Text.RegularExpressions;

class Tester
{
    public void Run()
    {
        string text = "We hold these truths to be self-evident, " +
          "that all men are created equal, " +
          "that they are endowed by their Creator with certain unalienable Rights, " +
          "that among these are Life, Liberty and the pursuit of Happiness.";
        StringBuilder sBuilder = new StringBuilder();
        Regex reg = new Regex(" |, |,");
        int i = 0;
        foreach (string s in reg.Split(text))
        {
            sBuilder.AppendFormat("{0}: {1}\n", i, s);
            i += 1;
        }
        Console.WriteLine(sBuilder);
    }
    static void Main()
    {
        Tester t = new Tester();
        t.Run();
    }
}

入出力結果(Console Window)

0: We
1: hold
2: these
3: truths
4: to
5: be
6: self-evident
7: that
8: all
9: men
10: are
11: created
12: equal
13: that
14: they
15: are
16: endowed
17: by
18: their
19: Creator
20: with
21: certain
22: unalienable
23: Rights
24: that
25: among
26: these
27: are
28: Life
29: Liberty
30: and
31: the
32: pursuit
33: of
34: Happiness.

続行するには何かキーを押してください . . .

ちなみにJavaScriptの場合。

コード(BBEdit)

var text = "We hold these truths to be self-evident, " +
    "that all men are created equal, " +
    "that they are endowed by their Creator with certain unalienable Rights, " +
    "that among these are Life, Liberty and the pursuit of Happiness.";

var result = "";
var i = 0;
var pattern = /\b(\w+)\b/g;
var s;
while ((s = pattern.exec(text)) !== null) {
    result += i + ": " + s[0] + "\n";
    i += 1;
}
$('#pre0').text(result);

pythonの場合。

sample.py

コード(BBEdit)

#!/usr/bin/env python3.3
# -*- coding: utf-8 -*-

import re

text = "We hold these truths to be self-evident, " + \
    "that all men are created equal, " + \
    "that they are endowed by their Creator with certain unalienable Rights, " + \
    "that among these are Life, Liberty and the pursuit of Happiness."

i = 0
for word in re.findall(r"\b\w+\b", text):
    print("{0}: {1}".format(i, word))
    i += 1

入出力結果(Terminal)

$ ./sample.py
0: We
1: hold
2: these
3: truths
4: to
5: be
6: self
7: evident
8: that
9: all
10: men
11: are
12: created
13: equal
14: that
15: they
16: are
17: endowed
18: by
19: their
20: Creator
21: with
22: certain
23: unalienable
24: Rights
25: that
26: among
27: these
28: are
29: Life
30: Liberty
31: and
32: the
33: pursuit
34: of
35: Happiness
$