diff --git a/loopback/locale/es.json b/loopback/locale/es.json
index 9a24f84ba..6199bb106 100644
--- a/loopback/locale/es.json
+++ b/loopback/locale/es.json
@@ -399,5 +399,5 @@
 	"All tickets have a route order": "Todos los tickets tienen orden de ruta",
 	"Price cannot be blank": "Price cannot be blank",
 	"There are tickets to be invoiced": "La zona tiene tickets por facturar",
-	"The value must be a number or a range of numbers": "The value must be a number or a range of numbers"
-}
\ No newline at end of file
+	"The value must be a number or a range of numbers": "El valor debe ser un número o un rango de números"
+}
diff --git a/modules/item/back/models/item-tag.js b/modules/item/back/models/item-tag.js
index 4c1ef4d4a..5a81f427f 100644
--- a/modules/item/back/models/item-tag.js
+++ b/modules/item/back/models/item-tag.js
@@ -12,7 +12,6 @@ module.exports = Self => {
     });
 
     Self.observe('before save', async ctx => {
-        const validValue = new RegExp('^\\d{1,3}(-\\d{1,3})?$');
         let tagFk;
         let value;
 
@@ -24,10 +23,13 @@ module.exports = Self => {
             value = ctx.data.value;
         }
         const models = Self.app.models;
-        const validTag = await models.Tag.findOne({where: {name: 'Longitud(m)'}});
+        const validTag = await models.Tag.findOne({where: {id: tagFk}});
 
-        if (tagFk === validTag.id) {
-            if ((value && !validValue.test(value)))
+        if (validTag.validationRegex) {
+            const regexString = validTag.validationRegex.replace(/\\\\/g, '\\');
+            const validExpresion = new RegExp(regexString);
+
+            if (value && !validExpresion.test(value))
                 throw new UserError('The value must be a number or a range of numbers');
         }
     });
diff --git a/modules/item/back/models/tag.json b/modules/item/back/models/tag.json
index 6c5f5c0ba..5269b849f 100644
--- a/modules/item/back/models/tag.json
+++ b/modules/item/back/models/tag.json
@@ -30,6 +30,9 @@
         "mysql": {
           "columnName": "isQuantitatif"
         }
+      },
+      "validationRegex": {
+        "type": "string"
       }
     },
     "acls": [