From 77e584616161738e7cb8a6908d2ed341f0241bc7 Mon Sep 17 00:00:00 2001
From: Fabien Potencier <fabien@potencier.org>
Date: Fri, 21 Feb 2020 09:29:07 +0100
Subject: [PATCH] Fix regression

---
 src/Lexer.php | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/Lexer.php b/src/Lexer.php
index 2de5fc79a..b93790c61 100644
--- a/src/Lexer.php
+++ b/src/Lexer.php
@@ -506,8 +506,9 @@ class Lexer implements \Twig_LexerInterface
             }
 
             // an operator that begins with a character must have a space before
+            // or a parenthesis
             if (ctype_alpha($operator[0])) {
-                $r = '(?<=\s)'.$r;
+                $r = '(?<=[\s(])'.$r;
             }
 
             // an operator with a space can be any amount of whitespaces