diff --git a/pages/api-reference/_meta.json b/pages/api-reference/_meta.json
index 299d937..3282e95 100644
--- a/pages/api-reference/_meta.json
+++ b/pages/api-reference/_meta.json
@@ -4,6 +4,7 @@
 	"luau": "Luau",
 	"net": "Net",
 	"process": "Process",
+	"regex": "Regex",
 	"roblox": "Roblox",
 	"serde": "Serde",
 	"stdio": "Stdio",
diff --git a/pages/api-reference/regex.md b/pages/api-reference/regex.md
new file mode 100644
index 0000000..c84361b
--- /dev/null
+++ b/pages/api-reference/regex.md
@@ -0,0 +1,230 @@
+# Regex
+
+Built-in library for regular expressions
+
+#### Example usage
+
+```lua
+local Regex = require("@lune/regex")
+
+local re = Regex.new("hello")
+
+if re:isMatch("hello, world!") then
+	print("Matched!")
+end
+
+local caps = re:captures("hello, world! hello, again!")
+
+print(#caps) -- 2
+print(caps:get(1)) -- "hello"
+print(caps:get(2)) -- "hello"
+print(caps:get(3)) -- nil
+```
+
+## Constructors
+
+### new
+
+Creates a new `Regex` from a given string pattern.
+
+#### Errors
+
+This constructor throws an error if the given pattern is invalid.
+
+#### Parameters
+
+-   `pattern` `string` The string pattern to use
+
+#### Returns
+
+-   `Regex` The new Regex object
+
+---
+
+## Methods
+
+### isMatch
+
+Check if the given text matches the regular expression.
+
+This method may be slightly more efficient than calling `find` if you only need to know if the text
+matches the pattern.
+
+#### Parameters
+
+-   `self` Regex
+
+-   `text` `string` The text to search
+
+#### Returns
+
+-   `boolean` Whether the text matches the pattern
+
+---
+
+### find
+
+Finds the first match in the given text.
+
+Returns `nil` if no match was found.
+
+#### Parameters
+
+-   `self` Regex
+
+-   `text` `string` The text to search
+
+#### Returns
+
+-   `RegexMatch?` The match object
+
+---
+
+### captures
+
+Finds all matches in the given text as a `RegexCaptures` object.
+
+Returns `nil` if no matches are found.
+
+#### Parameters
+
+-   `self` Regex
+
+-   `text` `string` The text to search
+
+#### Returns
+
+-   `RegexCaptures?` The captures object
+
+---
+
+### split
+
+Splits the given text using the regular expression.
+
+#### Parameters
+
+-   `self` Regex
+
+-   `text` `string` The text to split
+
+#### Returns
+
+-   `{ string }` The split text
+
+---
+
+### replace
+
+Replaces the first match in the given text with the given replacer string.
+
+#### Parameters
+
+-   `self` Regex
+
+-   `haystack` `string` The text to search
+
+-   `replacer` `string` The string to replace matches with
+
+#### Returns
+
+-   `string` The text with the first match replaced
+
+---
+
+### replaceAll
+
+Replaces all matches in the given text with the given replacer string.
+
+#### Parameters
+
+-   `self` Regex
+
+-   `haystack` `string` The text to search
+
+-   `replacer` `string` The string to replace matches with
+
+#### Returns
+
+-   `string` The text with all matches replaced
+
+---
+
+# RegexCaptures
+
+Captures from a regular expression.
+
+## Methods
+
+### get
+
+Returns the match at the given index, if one exists.
+
+#### Parameters
+
+-   `self` RegexCaptures
+
+-   `index` `number` The index of the match to get
+
+#### Returns
+
+-   `RegexMatch` The match, if one exists
+
+---
+
+### group
+
+Returns the match for the given named match group, if one exists.
+
+#### Parameters
+
+-   `self` RegexCaptures
+
+-   `group` `string` The name of the group to get
+
+#### Returns
+
+-   `RegexMatch` The match, if one exists
+
+---
+
+### format
+
+Formats the captures using the given format string.
+
+#### Example usage
+
+```lua
+local regex = require("@lune/regex")
+
+local re = regex.new("(?<day>[0-9]{2})-(?<month>[0-9]{2})-(?<year>[0-9]{4})")
+
+local caps = re:captures("On 14-03-2010, I became a Tenneessee lamb.");
+assert(caps ~= nil, "Example pattern should match example text")
+
+local formatted = caps:format("year=$year, month=$month, day=$day")
+print(formatted) -- "year=2010, month=03, day=14"
+```
+
+#### Parameters
+
+-   `self` RegexCaptures
+
+-   `format` `string` The format string to use
+
+#### Returns
+
+-   `string` The formatted string
+
+---
+
+# RegexMatch
+
+A match from a regular expression.
+
+Contains the following values:
+
+-   `start` -- The start index of the match in the original string.
+-   `finish` -- The end index of the match in the original string.
+-   `text` -- The text that was matched.
+-   `len` -- The length of the text that was matched.
diff --git a/pages/api-reference/stdio.md b/pages/api-reference/stdio.md
index ba83df6..f221307 100644
--- a/pages/api-reference/stdio.md
+++ b/pages/api-reference/stdio.md
@@ -16,6 +16,9 @@ stdio.write("Hello, ")
 stdio.write("World! ")
 stdio.write("All on the same line")
 stdio.ewrite("\nAnd some error text, too")
+
+-- Reading the entire input from stdin
+local input = stdio.readToEnd()
 ```
 
 ## Functions
@@ -124,3 +127,13 @@ Writes a string directly to stderr, without any newline.
 -   `s` The string to write to stderr
 
 ---
+
+### readToEnd
+
+Reads the entire input from stdin.
+
+#### Returns
+
+-   The input from stdin
+
+---