Add hex_color and slug custom types

src/outlines/types/__init__.py

@@ -86,6 +86,8 @@ def __getattr__(self, name):
     "ipv6",
     "semver",
     "mac_address",
+    "hex_color",
+    "slug",
     # Document-specific types
     "sentence",
     "paragraph",
@@ -160,6 +162,18 @@ def __getattr__(self, name):
     r"(?:\.(?:25[0-5]|2[0-4][0-9]|1?[0-9]{1,2})){3}"
 )
 
+# CSS hexadecimal color notation: https://www.w3.org/TR/css-color-4/#hex-notation
+# This matches only the ubiquitous three-digit (#rgb) and six-digit (#rrggbb)
+# forms. The four- and eight-digit forms that encode an alpha channel are
+# intentionally excluded to keep the type to the canonical opaque-color syntax.
+hex_color = Regex(r"#(?:[0-9A-Fa-f]{3}|[0-9A-Fa-f]{6})")
+
+# URL slugs in the lowercase-hyphenated form produced by common web framework
+# slugify helpers: ASCII lowercase alphanumeric groups separated by single
+# hyphens. Uppercase letters, underscores, and leading, trailing, or
+# consecutive hyphens are excluded, as is the empty string.
+slug = Regex(r"[a-z0-9]+(?:-[a-z0-9]+)*")
+
 # Document-specific types
 sentence = Regex(r"[A-Z].*\s*[.!?]")
 paragraph = Regex(rf"{sentence.pattern}(?:\s+{sentence.pattern})*\n+")

tests/types/test_custom_types.py

@@ -120,6 +120,24 @@
         (types.mac_address, "00:1A:2B:3C:4D:5E", True),
         (types.mac_address, "00-1A-2B-3C-4D-5E", False),
         (types.mac_address, "00:1A:2B:3C:4D", False),
+        (types.hex_color, "#1a2b3c", True),
+        (types.hex_color, "#abc", True),
+        (types.hex_color, "#ABC123", True),
+        (types.hex_color, "1a2b3c", False),
+        (types.hex_color, "#12345", False),
+        (types.hex_color, "#gggggg", False),
+        (types.hex_color, "#abcd", False),
+        (types.hex_color, "#aabbccdd", False),
+        (types.hex_color, " #abc", False),
+        (types.slug, "my-post-title", True),
+        (types.slug, "post", True),
+        (types.slug, "a1-b2", True),
+        (types.slug, "My-Post", False),
+        (types.slug, "-leading-hyphen", False),
+        (types.slug, "trailing-hyphen-", False),
+        (types.slug, "double--hyphen", False),
+        (types.slug, "under_score", False),
+        (types.slug, "", False),
     ],
 )
 def test_type_regex(custom_type, test_string, should_match):