Regex: add option to disable flagging of escaped forward slashes (IDEA-374632)

GitOrigin-RevId: 7d400d209bb9e7b9f385e112bf5178e97603aac0

RegExpSupport/resources/inspectionDescriptions/RegExpRedundantEscape.html

@@ -18,6 +18,9 @@ Many escape sequences that are necessary outside of a character class are redund
 <p>
 The <b>Ignore escaped closing brackets '}' and ']'</b> option specifies whether to report <code>\}</code> and <code>\]</code> outside of a character class
 when they are allowed to be unescaped by the RegExp dialect.
+<p>
+Similarly, the <b>Ignore escaped forward-slashes '/'</b> option specifies whether to report <code>\/</code> when
+they are allowed to be unescaped by the RegExp dialect.
 <p><small>New in 2017.3</small>
 </body>
 </html>

RegExpSupport/resources/messages/RegExpBundle.properties

@@ -92,6 +92,7 @@ inspection.name.single.character.alternation=Single character alternation
 inspection.name.suspicious.backref=Suspicious back reference
 inspection.name.unnecessary.non.capturing.group=Unnecessary non-capturing group
 inspection.option.ignore.escaped.closing.brackets=Ignore escaped closing brackets '}' and ']'
+inspection.option.ignore.escaped.forward.slashes=Ignore escaped forward-slashes '/'
 inspection.quick.fix.remove.duplicate.0.from.character.class=Remove duplicate ''{0}'' from character class
 inspection.quick.fix.remove.duplicate.branch=Remove duplicate branch
 inspection.quick.fix.remove.duplicate.element.from.character.class=Remove duplicate element from character class

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

@@ -1,4 +1,4 @@
-// Copyright 2000-2024 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license.
+// Copyright 2000-2025 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;
@@ -27,11 +27,14 @@ import static com.intellij.codeInspection.options.OptPane.pane;
 public class RegExpRedundantEscapeInspection extends LocalInspectionTool {
 
   public boolean ignoreEscapedMetaCharacters = false;
+  public boolean ignoreEscapedForwardSlashes = false;
 
   @Override
   public @NotNull OptPane getOptionsPane() {
     return pane(
-      checkbox("ignoreEscapedMetaCharacters", RegExpBundle.message("inspection.option.ignore.escaped.closing.brackets")));
+      checkbox("ignoreEscapedMetaCharacters", RegExpBundle.message("inspection.option.ignore.escaped.closing.brackets")),
+      checkbox("ignoreEscapedForwardSlashes", RegExpBundle.message("inspection.option.ignore.escaped.forward.slashes"))
+    );
   }
 
   @Override
@@ -59,6 +62,9 @@ public class RegExpRedundantEscapeInspection extends LocalInspectionTool {
       if (ignoreEscapedMetaCharacters && (text.equals("\\}") || text.equals("\\]")) && !(ch.getParent() instanceof RegExpClass)) {
         return;
       }
+      if (ignoreEscapedForwardSlashes && text.equals("\\/")) {
+        return;
+      }
       final ASTNode astNode = ch.getNode().getFirstChildNode();
       if (astNode == null || astNode.getElementType() != RegExpTT.REDUNDANT_ESCAPE) {
         return;

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

@@ -1,4 +1,4 @@
-// Copyright 2000-2021 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license.
+// Copyright 2000-2025 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;
@@ -37,9 +37,15 @@ public class RedundantEscapeInspectionTest extends RegExpInspectionTestCase {
     highlightTest("\\{TEST}", RegExpFileType.forLanguage(EcmaScriptRegexpLanguage.INSTANCE));
   }
 
+  public void testIgnoreSlashes() {
+    highlightTest("\\/\\/\\/[\\/]");
+  }
+
   @NotNull
   @Override
   protected LocalInspectionTool getInspection() {
-    return new RegExpRedundantEscapeInspection();
+    RegExpRedundantEscapeInspection inspection = new RegExpRedundantEscapeInspection();
+    if (getTestName(false).endsWith("IgnoreSlashes")) inspection.ignoreEscapedForwardSlashes = true;
+    return inspection;
   }
 }