$re = '/(?<=(\/\/\[JsonProperty\(Required = Required\.Always\)]\n)|(\/\/\[JsonProperty\(DefaultValueHandling = DefaultValueHandling\.Ignore\)]\n))( public [a-zA-Z]+ )/m';
$str = 'namespace Telegram.Bot.Types.Payments
{
/// <summary>
/// This object contains information about an incoming pre-checkout query
/// </summary>
//[JsonObject(MemberSerialization.OptIn, NamingStrategyType = typeof(SnakeCaseNamingStrategy))]
public sealed record PreCheckoutQuery
{
/// <summary>
/// Unique query identifier
/// </summary>
//[JsonProperty(Required = Required.Always)]
public string Id { get; set; }
/// <summary>
/// User who sent the query
/// </summary>
//[JsonProperty(Required = Required.Always)]
public User From { get; set; }
/// <summary>
/// Three-letter ISO 4217 currency code
/// </summary>
//[JsonProperty(Required = Required.Always)]
public string Currency { get; set; }
/// <summary>
/// Total price in the smallest units of the currency.
/// </summary>
//[JsonProperty(Required = Required.Always)]
public int TotalAmount { get; set; }
/// <summary>
/// Bot specified invoice payload
/// </summary>
//[JsonProperty(Required = Required.Always)]
public string InvoicePayload { get; set; }
/// <summary>
/// Optional. Identifier of the shipping option chosen by the user
/// </summary>
//[JsonProperty(DefaultValueHandling = DefaultValueHandling.Ignore)]
public string ShippingOptionId { get; set; }
/// <summary>
/// Optional. Order info provided by the user
/// </summary>
//[JsonProperty(DefaultValueHandling = DefaultValueHandling.Ignore)]
public OrderInfo OrderInfo { get; set; }
}
}
';
$subst = " [JsonPropertyName(\"\")]\n$0";
$result = preg_replace($re, $subst, $str);
echo "The result of the substitution is ".$result;
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php