From cf88c8eef3dbc0f010f09e8a2572aaed7d67f1e4 Mon Sep 17 00:00:00 2001
From: JT <547158+jntrnr@users.noreply.github.com>
Date: Sun, 27 Mar 2022 12:52:09 +1300
Subject: [PATCH] Improve escaping in string interpolation (#4982)

---
 crates/nu-parser/src/parser.rs | 9 ++++++++-
 src/tests/test_parser.rs       | 5 +++++
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/crates/nu-parser/src/parser.rs b/crates/nu-parser/src/parser.rs
index 97e9cbf95f..cadce688a5 100644
--- a/crates/nu-parser/src/parser.rs
+++ b/crates/nu-parser/src/parser.rs
@@ -1438,7 +1438,14 @@ pub fn parse_string_interpolation(
 
     #[allow(clippy::needless_range_loop)]
     while b != end {
-        if contents[b - start] == b'(' && mode == InterpolationMode::String {
+        if contents[b - start] == b'('
+            && (if double_quote && (b - start) > 0 {
+                contents[b - start - 1] != b'\\'
+            } else {
+                true
+            })
+            && mode == InterpolationMode::String
+        {
             mode = InterpolationMode::Expression;
             if token_start < b {
                 let span = Span {
diff --git a/src/tests/test_parser.rs b/src/tests/test_parser.rs
index 877e06f798..4b6eaab57a 100644
--- a/src/tests/test_parser.rs
+++ b/src/tests/test_parser.rs
@@ -345,6 +345,11 @@ fn string_escape_interpolation() -> TestResult {
     run_test(r#"$"\u015B(char hamburger)abc""#, "ś≡abc")
 }
 
+#[test]
+fn string_escape_interpolation2() -> TestResult {
+    run_test(r#"$"2 + 2 is \(2 + 2)""#, "2 + 2 is (2 + 2)")
+}
+
 #[test]
 fn proper_rest_types() -> TestResult {
     run_test(