Fix Regex types (#250)

types/regex.luau

@@ -19,42 +19,56 @@ local RegexMatch = {
 
 type RegexMatch = typeof(RegexMatch)
 
+local RegexCaptures = {}
+
+function RegexCaptures.get(self: RegexCaptures, index: number): RegexMatch?
+	return nil :: any
+end
+
+function RegexCaptures.group(self: RegexCaptures, group: string): RegexMatch?
+	return nil :: any
+end
+
+function RegexCaptures.format(self: RegexCaptures, format: string): string
+	return nil :: any
+end
+
 --[=[
 	@class RegexCaptures
 
 	Captures from a regular expression.
 ]=]
-local RegexCaptures = {}
-
+export type RegexCaptures = typeof(setmetatable(
+	{} :: {
 		--[=[
 			@within RegexCaptures
 			@tag Method
+			@method get
 
 			Returns the match at the given index, if one exists.
 
 			@param index -- The index of the match to get
 			@return RegexMatch -- The match, if one exists
 		]=]
-function RegexCaptures.get(self: RegexCaptures, index: number): RegexMatch?
-	return nil :: any
-end
+
+		get: (self: RegexCaptures, index: number) -> RegexMatch?,
 
 		--[=[
 			@within RegexCaptures
 			@tag Method
+			@method group
 
 			Returns the match for the given named match group, if one exists.
 
 			@param group -- The name of the group to get
 			@return RegexMatch -- The match, if one exists
 		]=]
-function RegexCaptures.group(self: RegexCaptures, group: string): RegexMatch?
-	return nil :: any
-end
+		group: (self: RegexCaptures, group: string) -> RegexMatch?,
 
 		--[=[
 			@within RegexCaptures
 			@tag Method
+			@method format
 
 			Formats the captures using the given format string.
 
@@ -75,11 +89,12 @@ end
 			@param format -- The format string to use
 			@return string -- The formatted string
 		]=]
-function RegexCaptures.format(self: RegexCaptures, format: string): string
-	return nil :: any
-end
-
-export type RegexCaptures = typeof(RegexCaptures)
+		format: (self: RegexCaptures, format: string) -> string,
+	},
+	{} :: {
+		__len: (self: RegexCaptures) -> number,
+	}
+))
 
 local Regex = {}