feat: implement FormatPatterns (#79)

Co-authored-by: Vlad Frangu <kingdgrizzle@gmail.com>

common/index.ts

@@ -164,3 +164,63 @@ export type Snowflake = `${bigint}`;
  * @internal
  */
 export type Permissions = `${bigint}`;
+
+/**
+ * https://discord.com/developers/docs/reference#message-formatting-formats
+ */
+export const FormattingPatterns = {
+	/**
+	 * Regular expression for matching a user mention, strictly without a nickname
+	 *
+	 * The `userID` group property is present on the `exec` result of this expression
+	 */
+	User: /<@(?<userID>\d{17,20})>/,
+	/**
+	 * Regular expression for matching a user mention, strictly with a nickname
+	 *
+	 * The `userID` group property is present on the `exec` result of this expression
+	 */
+	UserWithNickname: /<@!(?<userID>\d{17,20})>/,
+	/**
+	 * Regular expression for matching a user mention, with or without a nickname
+	 *
+	 * The `userID` group property is present on the `exec` result of this expression
+	 */
+	UserWithOptionalNickname: /<@!?(?<userID>\d{17,20})>/,
+	/**
+	 * Regular expression for matching a channel mention
+	 *
+	 * The `channelID` group property is present on the `exec` result of this expression
+	 */
+	Channel: /<#(?<channelID>\d{17,20})>/,
+	/**
+	 * Regular expression for matching a role mention
+	 *
+	 * The `roleID` group property is present on the `exec` result of this expression
+	 */
+	Role: /<@&(?<roleID>\d{17,20})>/,
+	/**
+	 * Regular expression for matching a custom emoji, either static or animated
+	 *
+	 * The `emojiAnimated`, `emojiName` and `emojiID` group properties are present on the `exec` result of this expression
+	 */
+	Emoji: /<(?<emojiAnimated>a)?:(?<emojiName>\w{2,32}):(?<emojiID>\d{17,20})>/,
+	/**
+	 * Regular expression for matching strictly an animated custom emoji
+	 *
+	 * The `emojiAnimated`, `emojiName` and `emojiID` group properties are present on the `exec` result of this expression
+	 */
+	AnimatedEmoji: /<(?<emojiAnimated>a):(?<emojiName>\w{2,32}):(?<emojiID>\d{17,20})>/,
+	/**
+	 * Regular expression for matching strictly a static custom emoji
+	 *
+	 * The `emojiName` and `emojiID` group properties are present on the `exec` result of this expression
+	 */
+	StaticEmoji: /<:(?<emojiName>\w{2,32}):(?<emojiID>\d{17,20})>/,
+} as const;
+
+/**
+ * Freezes the formatting patterns
+ * @internal
+ */
+Object.freeze(FormattingPatterns);