diff --git a/regexp.py b/regexp.py
--- a/regexp.py
+++ b/regexp.py
@@ -66,6 +66,44 @@ class Asterisk(Plus):
 		return str(self.content) + "*"
 
 
+class Alternative(Token):
+	def __init__(self, content: list):
+		self.variants = []
+		subsequence = []
+
+		for token in content:
+			if isinstance(token, AlternativeSeparator):
+				if not subsequence:
+					raise ParsingError("Found an empty Alternative variant.")
+				self.variants.append(Chain(subsequence))
+				subsequence = []
+			else:
+				subsequence.append(token)
+		
+		if not subsequence:
+				raise ParsingError("Found an empty Alternative variant.")
+		self.variants.append(Chain(subsequence))
+		
+
+	def list_first(self):
+		for x in self.variants:
+			yield from x.list_first()
+
+	def list_last(self):
+		for x in self.variants:
+			yield from x.list_last()
+	
+	def list_neighbours(self):
+		for x in self.variants:
+			yield from x.list_neighbours()
+
+	@property
+	def is_skippable(self):
+		return any(x.is_skippable for x in self.variants)
+
+class AlternativeSeparator:
+	pass
+
 class Chain(Token):
 	def __init__(self, content: list):
 		self.content = content
@@ -120,6 +158,7 @@ def find_closing_parenthesis(pattern, k)
 
 def parse(pattern, offset=0):
 	res = []
+	is_alternative = False
 
 	i = 0
 	while i < len(pattern):
@@ -145,11 +184,18 @@ def parse(pattern, offset=0):
 			i += 1
 		elif c == ")":
 			raise ParsingError(f'An opening parenthesis not found. Pattern: "{pattern}", position: {i}')
+		elif c == "|":
+			is_alternative = True
+			res.append(AlternativeSeparator())
+			i += 1
 		else:
 			res.append(Symbol(i+offset, c))
 			i += 1
 
-	return Chain(res)
+	if is_alternative:
+		return Alternative(res)
+	else:
+		return Chain(res)
 
 
 class Regexp: