diff --git a/lib/matplotlib/_fontconfig_pattern.py b/lib/matplotlib/_fontconfig_pattern.py
index efc1c9304f52..f0ed155c2d62 100644
--- a/lib/matplotlib/_fontconfig_pattern.py
+++ b/lib/matplotlib/_fontconfig_pattern.py
@@ -13,7 +13,7 @@
import re
from pyparsing import (
- Optional, ParseException, Regex, StringEnd, Suppress, ZeroOrMore)
+ Group, Optional, ParseException, Regex, StringEnd, Suppress, ZeroOrMore)
from matplotlib import _api
@@ -64,7 +64,7 @@ def comma_separated(elem):
name = Regex(r"[a-z]+")
value = Regex(r"([^%s]|(\\[%s]))*" % (_value_punc, _value_punc))
# replace trailing `| name` by oneOf(_CONSTANTS) in mpl 3.9.
- prop = (name + Suppress("=") + comma_separated(value)) | name
+ prop = Group((name + Suppress("=") + comma_separated(value)) | name)
return (
Optional(comma_separated(family)("families"))
+ Optional("-" + comma_separated(size)("sizes"))
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