Saya memerlukan ini untuk projek C#, jadi inilah Kod Python yang dinyatakan di atas. Pastikan anda memasukkan using System.Text.RegularExpressions; dalam fail sumber.

private string GetIndefiniteArticle(string noun_phrase)
{
    string word = null;
    var m = Regex.Match(noun_phrase, @"\w+");
    if (m.Success)
        word = m.Groups[0].Value;
    else
        return "an";

    var wordi = word.ToLower();
    foreach (string anword in new string[] { "euler", "heir", "honest", "hono" })
        if (wordi.StartsWith(anword))
            return "an";

    if (wordi.StartsWith("hour") && !wordi.StartsWith("houri"))
        return "an";

    var char_list = new char[] { 'a', 'e', 'd', 'h', 'i', 'l', 'm', 'n', 'o', 'r', 's', 'x' };
    if (wordi.Length == 1)
    {
        if (wordi.IndexOfAny(char_list) == 0)
            return "an";
        else
            return "a";
    }

    if (Regex.Match(word, "(?!FJO|[HLMNS]Y.|RY[EO]|SQU|(F[LR]?|[HL]|MN?|N|RH?|S[CHKLMNPTVW]?|X(YL)?)[AEIOU])[FHLMNRSX][A-Z]").Success)
        return "an";

    foreach (string regex in new string[] { "^e[uw]", "^onc?e\b", "^uni([^nmd]|mo)", "^u[bcfhjkqrst][aeiou]" })
    {
        if (Regex.IsMatch(wordi, regex))
            return "a";
    }

    if (Regex.IsMatch(word, "^U[NK][AIEO]"))
        return "a";
    else if (word == word.ToUpper())
    {
        if (wordi.IndexOfAny(char_list) == 0)
            return "an";
        else
            return "a";
    }

    if (wordi.IndexOfAny(new char[] { 'a', 'e', 'i', 'o', 'u' }) == 0)
        return "an";

    if (Regex.IsMatch(wordi, "^y(b[lor]|cl[ea]|fere|gg|p[ios]|rou|tt)"))
        return "an";

    return "a";
}

Apa yang anda mahukan ialah mengenal pasti artikel tak tentu yang sesuai. Lingua::EN:: Inflect ialah modul Perl yang berprestasi baik. Saya telah mengekstrak kod yang berkaitan dan menampalnya di bawah. Ia hanyalah sekumpulan kes dan beberapa ungkapan biasa, jadi pemindahan ke PHP tidak sepatutnya sukar. Rakan mengalihkannya ke Python Jika ada yang berminat, klik di sini.

# 2. INDEFINITE ARTICLES

# THIS PATTERN MATCHES STRINGS OF CAPITALS STARTING WITH A "VOWEL-SOUND"
# CONSONANT FOLLOWED BY ANOTHER CONSONANT, AND WHICH ARE NOT LIKELY
# TO BE REAL WORDS (OH, ALL RIGHT THEN, IT'S JUST MAGIC!)

my $A_abbrev = q{
(?! FJO | [HLMNS]Y.  | RY[EO] | SQU
  | ( F[LR]? | [HL] | MN? | N | RH? | S[CHKLMNPTVW]? | X(YL)?) [AEIOU])
[FHLMNRSX][A-Z]
};

# THIS PATTERN CODES THE BEGINNINGS OF ALL ENGLISH WORDS BEGINING WITH A
# 'y' FOLLOWED BY A CONSONANT. ANY OTHER Y-CONSONANT PREFIX THEREFORE
# IMPLIES AN ABBREVIATION.

my $A_y_cons = 'y(b[lor]|cl[ea]|fere|gg|p[ios]|rou|tt)';

# EXCEPTIONS TO EXCEPTIONS

my $A_explicit_an = enclose join '|',
(
    "euler",
    "hour(?!i)", "heir", "honest", "hono",
);

my $A_ordinal_an = enclose join '|',
(
    "[aefhilmnorsx]-?th",
);

my $A_ordinal_a = enclose join '|',
(
    "[bcdgjkpqtuvwyz]-?th",
);

sub A {
    my ($str, $count) = @_;
    my ($pre, $word, $post) = ( $str =~ m/\A(\s*)(?:an?\s+)?(.+?)(\s*)\Z/i );
    return $str unless $word;
    my $result = _indef_article($word,$count);
    return $pre.$result.$post;
}

sub AN { goto &A }

sub _indef_article {
    my ( $word, $count ) = @_;

    $count = $persistent_count
        if !defined($count) && defined($persistent_count);

    return "$count $word"
        if defined $count && $count!~/^($PL_count_one)$/io;

    # HANDLE USER-DEFINED VARIANTS

    my $value;
    return "$value $word"
        if defined($value = ud_match($word, @A_a_user_defined));

    # HANDLE ORDINAL FORMS

    $word =~ /^($A_ordinal_a)/i         and return "a $word";
    $word =~ /^($A_ordinal_an)/i        and return "an $word";

    # HANDLE SPECIAL CASES

    $word =~ /^($A_explicit_an)/i       and return "an $word";
    $word =~ /^[aefhilmnorsx]$/i        and return "an $word";
    $word =~ /^[bcdgjkpqtuvwyz]$/i      and return "a $word";


    # HANDLE ABBREVIATIONS

    $word =~ /^($A_abbrev)/ox           and return "an $word";
    $word =~ /^[aefhilmnorsx][.-]/i     and return "an $word";
    $word =~ /^[a-z][.-]/i              and return "a $word";

    # HANDLE CONSONANTS

    $word =~ /^[^aeiouy]/i              and return "a $word";

    # HANDLE SPECIAL VOWEL-FORMS

    $word =~ /^e[uw]/i                  and return "a $word";
    $word =~ /^onc?e\b/i                and return "a $word";
    $word =~ /^uni([^nmd]|mo)/i         and return "a $word";
    $word =~ /^ut[th]/i                 and return "an $word";
    $word =~ /^u[bcfhjkqrst][aeiou]/i   and return "a $word";

    # HANDLE SPECIAL CAPITALS

    $word =~ /^U[NK][AIEO]?/            and return "a $word";

    # HANDLE VOWELS

    $word =~ /^[aeiou]/i                and return "an $word";

    # HANDLE y... (BEFORE CERTAIN CONSONANTS IMPLIES (UNNATURALIZED) "i.." SOUND)

    $word =~ /^($A_y_cons)/io           and return "an $word";

    # OTHERWISE, GUESS "a"
    return "a $word";
}