Fix issue #5293

Author: JeffGuKang

src/Adapters/Storage/Postgres/PostgresStorageAdapter.js

@@ -5,6 +5,7 @@ import Parse from 'parse/node';
 // @flow-disable-next
 import _ from 'lodash';
 import sql from './sql';
+import { XRegExp } = from 'xregexp';
 
 const PostgresRelationDoesNotExistError = '42P01';
 const PostgresDuplicateRelationError = '42P07';
@@ -2438,15 +2439,16 @@ function createLiteralRegex(remaining) {
   return remaining
     .split('')
     .map(c => {
-      if (c.match(/[0-9a-zA-Z]/) !== null) {
+      const regex = XRegExp('[0-9 ]|\\p{L}'); // Support all unicode letter chars
+      if (c.match(regex) !== null) {
         // don't escape alphanumeric characters
         return c;
       }
       // escape everything else (single quotes with single quotes, everything else with a backslash)
       return c === `'` ? `''` : `\\${c}`;
     })
     .join('');
-}
+ }
 
 function literalizeRegexPart(s: string) {
   const matcher1 = /\\Q((?!\\E).*)\\E$/;