From 2af6236fd9873b1b489bdc4f4385d14654d9a5bf Mon Sep 17 00:00:00 2001
From: John Mayfield <john@nextmovesoftware.com>
Date: Wed, 6 Mar 2024 11:44:30 +0000
Subject: [PATCH] SonarCloud complains if the capturing groups are removed
 (Group parts of the regex together).

---
 .../smarts/src/main/java/org/openscience/cdk/smirks/Smirks.java | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tool/smarts/src/main/java/org/openscience/cdk/smirks/Smirks.java b/tool/smarts/src/main/java/org/openscience/cdk/smirks/Smirks.java
index 8a90aa2fb1..689cb5fd27 100644
--- a/tool/smarts/src/main/java/org/openscience/cdk/smirks/Smirks.java
+++ b/tool/smarts/src/main/java/org/openscience/cdk/smirks/Smirks.java
@@ -672,7 +672,7 @@ else if (begNborIdx != endNborIdx) {
 
     private static String generateAtom(IAtom atom) {
         return "[" + Smarts.generateAtom(((QueryAtom) atom).getExpression())
-                           .replaceAll("^\\[|]$", "") + ":" + getMapIdx(atom) + "]";
+                           .replaceAll("(?:^\\[)|(?:]$)", "") + ":" + getMapIdx(atom) + "]";
     }
 
     private static void checkAtomMap(SmirksState state, IAtom atom) {