IJPL-253402 [regexp]: ignore single character alternation with dot

GitOrigin-RevId: f3f5b994e2b2e2376f963895ee760cd6b774bafd

Author: BasLeijdekkers

RegExpSupport/src/org/intellij/lang/regexp/inspection/SingleCharAlternationInspection.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2025 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license.
+// Copyright 2000-2026 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license.
 package org.intellij.lang.regexp.inspection;
 
 import com.intellij.codeInspection.CommonQuickFixBundle;
@@ -56,7 +56,7 @@ private static boolean isSingleChar(RegExpBranch branch) {
       final RegExpAtom[] atoms = branch.getAtoms();
       if (atoms.length != 1) return false;
       RegExpAtom atom = atoms[0];
-      return atom instanceof RegExpChar || atom instanceof RegExpSimpleClass;
+      return atom instanceof RegExpChar || (atom instanceof RegExpSimpleClass c && c.getKind() != RegExpSimpleClass.Kind.ANY);
     }
 
     private static class SingleCharAlternationFix extends PsiUpdateModCommandQuickFix {

RegExpSupport/test/org/intellij/lang/regexp/inspection/SingleCharAlternationInspectionTest.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2025 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license.
+// Copyright 2000-2026 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license.
 package org.intellij.lang.regexp.inspection;
 
 import com.intellij.codeInspection.LocalInspectionTool;
@@ -13,7 +13,7 @@ public class SingleCharAlternationInspectionTest extends RegExpInspectionTestCas
   public void testSimple() {
     highlightTest("<warning descr=\"Single character alternation in RegExp\">a|b|c|d</warning>");
   }
-  
+
   public void testSimpleCharacterClass() {
     highlightTest("<warning descr=\"Single character alternation in RegExp\">\\d|a</warning>");
   }
@@ -26,6 +26,10 @@ public void testNoWarnNoException() {
     highlightTest("(?i)x|y");
   }
 
+  public void testNoWarnOnDot() {
+    highlightTest(".|\\r|\\n");
+  }
+
   public void testQuickfix() {
     quickfixTest("<warning descr=\"Single character alternation in RegExp\">x|y|z</warning>", "[xyz]", "Replace with '[xyz]'");
   }
@@ -53,9 +57,8 @@ public void testRedundantEscapeReplacement2() {
                  "Replace with '[+\\-*/=<>\\[\\].,:;(^]'");
   }
 
-  @NotNull
   @Override
-  protected LocalInspectionTool getInspection() {
+  protected @NotNull LocalInspectionTool getInspection() {
     return new SingleCharAlternationInspection();
   }
 }