diff --git a/src/MDConcWeights.php b/src/MDConcWeights.php
index a626133..3a4654a 100644
--- a/src/MDConcWeights.php
+++ b/src/MDConcWeights.php
@@ -10,14 +10,15 @@ declare(strict_types = 1);
  * Provides lists for categorizing misspelled sizes.
  */
 final class MDConcWeights implements MDImporterConcordanceListInterface {
+
     /**
-     * Require a function for getting the concordance target.
+     * Matches.
      *
      * @param string $input Input string.
      *
      * @return MDWeightUnit|false
      */
-    public static function getConcordanceTarget(string $input):MDWeightUnit|false {
+    private static function _match(string $input):MDWeightUnit|false {
 
         return match($input) {
 
@@ -34,4 +35,27 @@ final class MDConcWeights implements MDImporterConcordanceListInterface {
         };
 
     }
+
+    /**
+     * Require a function for getting the concordance target.
+     *
+     * @param string $input Input string.
+     *
+     * @return MDWeightUnit|false
+     */
+    public static function getConcordanceTarget(string $input):MDWeightUnit|false {
+
+        try {
+            return self::_match($input);
+        }
+        catch (MDInvalidWeightUnit $e) {
+
+            if (is_numeric($input) || is_numeric(strtr($input, ['.' => '', ',' => '']))) {
+                return false;
+            }
+
+            return self::_match(trim($input));
+        }
+
+    }
 }