MAGETWO-91465: Once integer is stored for State/Province field, it can not be changed to alphanumeric

Author: rganin

app/code/Magento/Ui/view/base/web/js/form/element/region.js

@@ -57,6 +57,7 @@ define([
                     registry.get(this.customName, function (input) {
                         isRegionRequired = !!option['is_region_required'];
                         input.validation['required-entry'] = isRegionRequired;
+                        input.validation['validate-not-number-first'] = true;
                         input.required(isRegionRequired);
                     });
                 }

app/code/Magento/Ui/view/base/web/js/lib/validation/rules.js

@@ -755,6 +755,12 @@ define([
             },
             $.mage.__('Please use only letters (a-z or A-Z) or numbers (0-9) in this field. No spaces or other characters are allowed.')//eslint-disable-line max-len
         ],
+        'validate-not-number-first': [
+            function (value) {
+                return utils.isEmptyNoTrim(value) || /^[^0-9].*$$/.test(value);
+            },
+            $.mage.__('First character must be letter.')//eslint-disable-line max-len
+        ],
         'validate-date': [
             function (value, params, additionalParams) {
                 var test = moment(value, additionalParams.dateFormat);