diff --git a/parsimonious/expressions.py b/parsimonious/expressions.py
index eba983b..0679527 100644
--- a/parsimonious/expressions.py
+++ b/parsimonious/expressions.py
@@ -7,7 +7,7 @@
 # anything--for speed. And kill all the dots.
 
 from inspect import getfullargspec, isfunction, ismethod, ismethoddescriptor
-import re
+import regex as re
 
 from parsimonious.exceptions import ParseError, IncompleteParseError
 from parsimonious.nodes import Node, RegexNode
diff --git a/setup.py b/setup.py
index f2e2ab5..89b9ce8 100644
--- a/setup.py
+++ b/setup.py
@@ -17,6 +17,7 @@
     test_suite='tests',
     url='https://github.com/erikrose/parsimonious',
     include_package_data=True,
+    install_requires=['regex>=2022.3.15'],
     classifiers=[
         'Intended Audience :: Developers',
         'Natural Language :: English',