Fixes:
bcb24ce7 ("attachment_urlに指定可能なURLを140字のカウントから除外する")
/// attachment_url に指定可能な URL を判定する正規表現
/// </summary>
public static readonly Regex AttachmentUrlRegex = new Regex(@"https?://(
- twitter\.com/[0-9A-Za-z]+/status/[0-9]+
- | mobile\.twitter\.com/[0-9A-Za-z]+/status/[0-9]+
+ twitter\.com/[0-9A-Za-z_]+/status/[0-9]+
+ | mobile\.twitter\.com/[0-9A-Za-z_]+/status/[0-9]+
| twitter\.com/messages/compose\?recipient_id=[0-9]+(&.+)?
)$", RegexOptions.IgnoreCase | RegexOptions.IgnorePatternWhitespace);