unescape copied text from regexps

java/java-impl/src/com/intellij/codeInsight/editorActions/StringLiteralCopyPasteProcessor.java

@@ -98,7 +98,7 @@ public class StringLiteralCopyPasteProcessor implements CopyPastePreProcessor {
         numberOfSymbolsToCopy = Math.min(escapedEndOffset, fileEndOffset) - Math.max(fileStartOffset, escapedStartOffset);
         if (numberOfSymbolsToCopy > 0) {
           textWasChanged = true;
-          buffer.append(unescapeStringCharacters(text.substring(givenTextStartOffset, givenTextStartOffset + numberOfSymbolsToCopy)));
+          buffer.append(unescape(text.substring(givenTextStartOffset, givenTextStartOffset + numberOfSymbolsToCopy), element));
           givenTextStartOffset += numberOfSymbolsToCopy;
         }
 
@@ -112,7 +112,12 @@ public class StringLiteralCopyPasteProcessor implements CopyPastePreProcessor {
     }
     return textWasChanged ? buffer.toString() : null;
   }
-  
+
+  @NotNull
+  protected String unescape(String text, PsiElement token) {
+    return unescapeStringCharacters(text);
+  }
+
   public String preprocessOnPaste(final Project project, final PsiFile file, final Editor editor, String text, final RawText rawText) {
     final Document document = editor.getDocument();
     PsiDocumentManager.getInstance(project).commitDocument(document);

platform/util/src/com/intellij/openapi/util/text/StringUtil.java

@@ -1655,6 +1655,32 @@ public class StringUtil {
       idx += 2;
     }
   }
+  
+  public static String unescapeSlashes(@NotNull final String str) {
+    final StringBuilder buf = StringBuilderSpinAllocator.alloc();
+    try {
+      unescapeSlashes(buf, str);
+      return buf.toString();
+    }
+    finally {
+      StringBuilderSpinAllocator.dispose(buf); 
+    }
+  }
+
+  private static void unescapeSlashes(StringBuilder buf, String str) {
+    final int length = str.length();
+    final int last = length - 1;
+    for (int i = 0; i < length; i++) {
+      char ch = str.charAt(i);
+      if (ch == '\\' && i != last) {
+        i++;
+        ch = str.charAt(i);
+        if (ch != '/') buf.append('\\');
+      }
+
+      buf.append(ch);
+    }
+  }
 
   public static void quote(@NotNull final StringBuilder builder) {
     quote(builder, '\"');

plugins/groovy/src/org/jetbrains/plugins/groovy/lang/editor/GroovyLiteralCopyPasteProcessor.java

@@ -64,7 +64,12 @@ public class GroovyLiteralCopyPasteProcessor extends StringLiteralCopyPasteProce
     IElementType tokenType = token.getNode().getElementType();
 
     if (tokenType == mREGEX_CONTENT || tokenType == mREGEX_LITERAL) {
-      return StringUtil.escapeSlashes(s);
+      if (escapeSlashes) {
+        return StringUtil.escapeSlashes(s);
+      }
+      else {
+        return s;
+      }
     }
 
     String chars;
@@ -87,4 +92,17 @@ public class GroovyLiteralCopyPasteProcessor extends StringLiteralCopyPasteProce
     StringUtil.escapeStringCharacters(s.length(), s, chars, escapeSlashes, buffer);
     return buffer.toString();
   }
+
+  @NotNull
+  @Override
+  protected String unescape(String text, PsiElement token) {
+    final IElementType tokenType = token.getNode().getElementType();
+
+    if (tokenType == mREGEX_CONTENT || tokenType == mREGEX_LITERAL) {
+      return StringUtil.unescapeSlashes(text);
+    }
+
+    return super.unescape(text, token);
+  }
+
 }

plugins/groovy/test/org/jetbrains/plugins/groovy/GroovyCopyPasteTest.groovy

@@ -54,7 +54,7 @@ class GroovyCopyPasteTest extends LightCodeInsightFixtureTestCase {
     myFixture.performEditorAction IdeActions.ACTION_COPY
     myFixture.configureByText 'b.groovy', 'def x = "smth<caret>h"'
     myFixture.performEditorAction IdeActions.ACTION_PASTE
-    myFixture.checkResult 'def x = "smth$a<caret>h"'
+    myFixture.checkResult 'def x = "smth\\$a<caret>h"'
 
   }