diff --git a/client/components/Search/BaseList.js b/client/components/Search/BaseList.js
index ba734a6..f2adcd2 100644
--- a/client/components/Search/BaseList.js
+++ b/client/components/Search/BaseList.js
@@ -371,7 +371,8 @@ export default class BaseList {
                 bookValue = emptyFieldValue;
 
             bookValue = bookValue.toLowerCase();
-            searchValue = searchValue.toLowerCase();
+            if (searchValue[0] !== '~')
+                searchValue = searchValue.toLowerCase();
 
             //особая обработка префиксов
             if (searchValue[0] == '=') {
diff --git a/server/core/DbSearcher.js b/server/core/DbSearcher.js
index 7ba8970..0b2d7a5 100644
--- a/server/core/DbSearcher.js
+++ b/server/core/DbSearcher.js
@@ -49,7 +49,8 @@ class DbSearcher {
     getWhere(a) {
         const db = this.db;
 
-        a = a.toLowerCase();
+        if (a[0] !== '~')
+            a = a.toLowerCase();
         let where;
 
         //особая обработка префиксов
diff --git a/server/core/opds/BasePage.js b/server/core/opds/BasePage.js
index 38eeb9a..83695a9 100644
--- a/server/core/opds/BasePage.js
+++ b/server/core/opds/BasePage.js
@@ -243,7 +243,8 @@ class BasePage {
                 bookValue = emptyFieldValue;
 
             bookValue = bookValue.toLowerCase();
-            searchValue = searchValue.toLowerCase();
+            if (searchValue[0] !== '~')
+                searchValue = searchValue.toLowerCase();
 
             //особая обработка префиксов
             if (searchValue[0] == '=') {