@Override
    public void visitRegExpChar(RegExpChar ch) {
      if (ch.getType() != RegExpChar.Type.CHAR) {
        return;
      }
      final String text = ch.getUnescapedText();
      if (text.length() != 2 || text.charAt(0) != '\\') {
        return;
      }
      final char c = text.charAt(1);
      if ("{}().*+?|$".indexOf(c) < 0) {
        return;
      }
      final ASTNode node = ch.getNode().getFirstChildNode();
      if (node != null && node.getElementType() == RegExpTT.REDUNDANT_ESCAPE) {
        return;
      }
      myHolder.registerProblem(ch, RegExpBundle.message("inspection.warning.escaped.meta.character.0", c), new EscapedMetaCharacterFix(c));
    }
@Override
    public void visitRegExpChar(RegExpChar ch)