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

Author: rganin

app/code/Magento/Customer/view/frontend/templates/address/edit.phtml

@@ -112,7 +112,7 @@
                        name="region"
                        value="<?= $block->escapeHtmlAttr($block->getRegion()) ?>"
                        title="<?= $block->escapeHtmlAttr(__('State/Province')) ?>"
-                       class="input-text <?= $block->escapeHtmlAttr($this->helper('Magento\Customer\Helper\Address')->getAttributeValidationClass('region')) ?>"<?= !$block->getConfig('general/region/display_all') ? ' disabled="disabled"' : '' ?>/>
+                       class="input-text validate-not-number-first <?= $block->escapeHtmlAttr($this->helper('Magento\Customer\Helper\Address')->getAttributeValidationClass('region')) ?>"<?= !$block->getConfig('general/region/display_all') ? ' disabled="disabled"' : '' ?>/>
             </div>
         </div>
         <div class="field zip required">

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

@@ -759,7 +759,7 @@ define([
             function (value) {
                 return utils.isEmptyNoTrim(value) || /^[^0-9-\.].*$/.test(value);
             },
-            $.mage.__('First character must be letter.')//eslint-disable-line max-len
+            $.mage.__('First character must be letter.')
         ],
         'validate-date': [
             function (value, params, additionalParams) {

lib/web/mage/validation.js

@@ -990,6 +990,12 @@
             },
             $.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 $.mage.isEmptyNoTrim(value) || /^[^0-9-\.].*$/.test(value);
+            },
+            $.mage.__('First character must be letter.')
+        ],
         'validate-date': [
             function (value, params, additionalParams) {
                 var test = moment(value, additionalParams.dateFormat);