Solution : Advance search page allow minus price filter

Author: Rohan Hapani

app/code/Magento/CatalogSearch/view/frontend/templates/advanced/form.phtml

@@ -68,7 +68,7 @@
                                    class="input-text"
                                    type="text"
                                    maxlength="<?= $block->escapeHtmlAttr($maxQueryLength) ?>"
-                                   data-validate="{number:true, 'less-than-equals-to':'#<?= $block->escapeHtmlAttr($_code) ?>_to'}" />
+                                   data-validate="{number:true, 'validate-not-negative-number':true, 'less-than-equals-to':'#<?= $block->escapeHtmlAttr($_code) ?>_to'}" />
                         </div>
                     </div>
                     <div class="field with-addon no-label">
@@ -81,7 +81,7 @@
                                        class="input-text"
                                        type="text"
                                        maxlength="<?= $block->escapeHtmlAttr($maxQueryLength) ?>"
-                                       data-validate="{number:true, 'greater-than-equals-to':'#<?= $block->escapeHtmlAttr($_code) ?>'}" />
+                                       data-validate="{number:true, 'validate-not-negative-number':true, 'greater-than-equals-to':'#<?= $block->escapeHtmlAttr($_code) ?>'}" />
                                 <label class="addafter"
                                        for="<?= $block->escapeHtmlAttr($_code) ?>_to">
                                     <?= $block->escapeHtml($block->getCurrency($_attribute)) ?>