diff --git a/app/Services/ImportProcessor.php b/app/Services/ImportProcessor.php
index 92854f0..922fc47 100644
--- a/app/Services/ImportProcessor.php
+++ b/app/Services/ImportProcessor.php
@@ -183,10 +183,7 @@ public function process(Import $import, ?Authenticatable $user = null): array
                 }
                 // Preflight: warn if any mapped source columns are not present in the header (exact match)
                 $headerSet = [];
-                foreach ($header as $h) {
-                    $headerSet[$h] = true;
-                }
-                $missingSources = [];
+                // Regex validation removed per request; rely on basic length/placeholder checks only
                 foreach ($mappings as $map) {
                     $src = (string) ($map->source_column ?? '');
                     if ($src !== '' && ! array_key_exists($src, $headerSet)) {