NotEnoughItems/src/main/java/codechicken/nei/recipe/SearchInputDropHandler.java

package codechicken.nei.recipe;

import codechicken.nei.api.INEIGuiAdapter;
import net.minecraft.client.gui.inventory.GuiContainer;
import net.minecraft.item.ItemStack;
import net.minecraftforge.fluids.FluidStack;
import net.minecraft.util.EnumChatFormatting;

import java.util.regex.Pattern;
import static codechicken.nei.LayoutManager.searchField;

public class SearchInputDropHandler extends INEIGuiAdapter
{

    protected static final Pattern SPECIAL_REGEX_CHARS = Pattern.compile("[{}()\\[\\].+*?^$\\\\|]");

    @Override
    public boolean handleDragNDrop(GuiContainer gui, int mouseX, int mouseY, ItemStack draggedStack, int button)
    {
        
        if (searchField.contains(mouseX, mouseY)) {
            final FluidStack fluidStack = StackInfo.getFluid(draggedStack);

            if (fluidStack != null) {
                searchField.setText(formattingText(fluidStack.getLocalizedName()));
            } else {
                searchField.setText(formattingText(draggedStack.getDisplayName()));
            }

            return true;
        }

        return false;
    }

    protected String formattingText(String displayName)
    {
        return SPECIAL_REGEX_CHARS.matcher(EnumChatFormatting.getTextWithoutFormattingCodes(displayName)).replaceAll("\\\\$0");
    }

}