diff --git a/src/index.js b/src/index.js
index 8de3518..17bfbb5 100644
--- a/src/index.js
+++ b/src/index.js
@@ -28,14 +28,14 @@ app.get('/api/qrcode', async (req, res) => {
         }
     }
 
-    check('client_name', /^[a-zA-Z0-9ČŠŽĐ](?:[A-Z0-9 ČŠŽĐ]{0,31}[A-Z0-9ČŠŽĐ])?$/i)
+    check('client_name', /^[a-zA-Z0-9ČŠŽĐ'](?:[A-Z0-9 ČŠŽĐ']{0,31}[A-Z0-9ČŠŽĐ'])?$/i)
     check('client_address', /^[a-zA-Z0-9ČŠŽĐ](?:[A-Z0-9 ČŠŽĐ]{0,31}[A-Z0-9ČŠŽĐ])?$/i)
     check('client_city', /^[a-zA-Z0-9ČŠŽĐ](?:[A-Z0-9 ČŠŽĐ]{0,31}[A-Z0-9ČŠŽĐ])?$/i)
     check('amount', /^(?=.{11}$)[0]{1,11}[0-9]{0,11}$/)
     check('payment_purpose', /^[A-Z0-9ČŠŽĐ](?:[A-Z0-9 ČŠŽĐ]{0,40}[A-Z0-9ČŠŽĐ])?$/i)
     check('iban', /^[A-Z]{2}\d{17}$/)
     check('reference', /^[A-Z]{2}[0-9\-]{1,24}$/)
-    check('issuer_name', /^[a-zA-Z0-9ČŠŽĐ](?:[A-Z0-9 ČŠŽĐ]{0,31}[A-Z0-9ČŠŽĐ])?$/i)
+    check('issuer_name', /^[a-zA-Z0-9ČŠŽĐ'](?:[A-Z0-9 ČŠŽĐ']{0,31}[A-Z0-9ČŠŽĐ'])?$/i)
     check('issuer_address', /^[a-zA-Z0-9ČŠŽĐ](?:[A-Z0-9 ČŠŽĐ]{0,31}[A-Z0-9ČŠŽĐ])?$/i)
     check('issuer_city', /^[a-zA-Z0-9ČŠŽĐ](?:[A-Z0-9 ČŠŽĐ]{0,31}[A-Z0-9ČŠŽĐ])?$/i)
 
diff --git a/src/views/index.ejs b/src/views/index.ejs
index 049bebb..29d3982 100644
--- a/src/views/index.ejs
+++ b/src/views/index.ejs
@@ -118,9 +118,9 @@ section div {
             <p>Following the specification from official documentation - <a href="https://www.upn-qr.si/uploads/files/NavodilaZaProgramerjeUPNQR.pdf">NavodilaZaProgramerjeUPNQR.pdf</a>, section <code>4. Vsebina kode QR</code>.</p>
             <h5 id="api-qrcode-client_name"><a href="#api-qrcode-client_name">&#128279;</a> <code>client_name</code></h5>
             <div>
-                <span>Regex: <code>^[a-zA-Z0-9ČŠŽĐ](?:[A-Z0-9 ČŠŽĐ]{0,31}[A-Z0-9ČŠŽĐ])?$/i</code></span>
+                <span>Regex: <code>^[a-zA-Z0-9ČŠŽĐ'](?:[A-Z0-9 ČŠŽĐ']{0,31}[A-Z0-9ČŠŽĐ'])?$/i</code></span>
                 <br>
-                <span>Demo: <a href="https://regex101.com/r/t9EaM3/1">regex101.com/r/t9EaM3/1</a></span>
+                <span>Demo: <a href="https://regex101.com/r/pNmOI0/1">regex101.com/r/pNmOI0/1</a></span>
                 <br>
                 <span>Description: Name and surname of the client. Max length 33 characters including spaces and numbers.</span>
                 <br>
@@ -208,9 +208,9 @@ section div {
             
             <h5 id="api-qrcode-issuer_name"><a href="#api-qrcode-issuer_name">&#128279;</a> <code>issuer_name</code></h5>
             <div>
-                <span>Regex: <code>^[a-zA-Z0-9ČŠŽĐ](?:[A-Z0-9 ČŠŽĐ]{0,31}[A-Z0-9ČŠŽĐ])?$/i</code></span>
+                <span>Regex: <code>^[a-zA-Z0-9ČŠŽĐ'](?:[A-Z0-9 ČŠŽĐ']{0,31}[A-Z0-9ČŠŽĐ'])?$/i</code></span>
                 <br>
-                <span>Demo: <a href="https://regex101.com/r/DFjB0D/1">regex101.com/r/DFjB0D/1</a></span>
+                <span>Demo: <a href="https://regex101.com/r/JW7Ywq/1">regex101.com/r/JW7Ywq/1</a></span>
                 <br>
                 <span>Description: Name and surname of the issuer or company name. Max length 33 characters including spaces and numbers.</span>
                 <br>