diff --git a/public_html/deployment/classes/project.class.php b/public_html/deployment/classes/project.class.php
index 9b08ee6d488a9e753d711dce26f2cde353cbd5cf..bee8617bda817d24772beca2ded722762e87ff53 100644
--- a/public_html/deployment/classes/project.class.php
+++ b/public_html/deployment/classes/project.class.php
@@ -3614,7 +3614,7 @@ class project extends base {
             'value' => $this->_aPrjConfig["fileprefix"],
             'required' => 'required',
             'validate' => 'isastring',
-            'pattern' => '[a-z0-9\-\_]*',
+            'pattern' => '[a-z0-9\-_]*',
             'size' => 100,
             'placeholder' => '',
         );
@@ -4178,7 +4178,7 @@ class project extends base {
                         'required' => 'required',
                         'validate' => 'isastring',
                         'size' => 100,
-                        'pattern' => '[a-z0-9\-\_]*',
+                        'pattern' => '[a-z0-9\-_]*',
                         'placeholder' => t("class-project-info-setup-projectId-placeholder"),
                     ),
                 ),