diff --git a/inc/field/emailfield.class.php b/inc/field/emailfield.class.php
index 5dea74fca..68d0b9c7c 100644
--- a/inc/field/emailfield.class.php
+++ b/inc/field/emailfield.class.php
@@ -150,7 +150,7 @@ public function lessThan($value): bool {
    }
 
    public function regex($value): bool {
-      return (preg_grep($value, $this->value)) ? true : false;
+      return (preg_match($value, $this->value) === 1) ? true : false;
    }
 
    public function isPublicFormCompatible(): bool {
diff --git a/inc/field/floatfield.class.php b/inc/field/floatfield.class.php
index faa53a781..17c9f50b0 100644
--- a/inc/field/floatfield.class.php
+++ b/inc/field/floatfield.class.php
@@ -268,7 +268,7 @@ public function lessThan($value): bool {
    }
 
    public function regex($value): bool {
-      return (preg_grep($value, $this->value)) ? true : false;
+      return (preg_match($value, $this->value) === 1) ? true : false;
    }
 
    public function isPublicFormCompatible(): bool {
diff --git a/inc/field/hiddenfield.class.php b/inc/field/hiddenfield.class.php
index 00942d72a..c6aff20f3 100644
--- a/inc/field/hiddenfield.class.php
+++ b/inc/field/hiddenfield.class.php
@@ -140,7 +140,7 @@ public function lessThan($value): bool {
    }
 
    public function regex($value): bool {
-      return (preg_grep($value, $this->value)) ? true : false;
+      return (preg_match($value, $this->value) === 1) ? true : false;
    }
 
    public function isPublicFormCompatible(): bool {
diff --git a/inc/field/hostnamefield.class.php b/inc/field/hostnamefield.class.php
index 5b494aa2e..068b7e723 100644
--- a/inc/field/hostnamefield.class.php
+++ b/inc/field/hostnamefield.class.php
@@ -145,7 +145,7 @@ public function lessThan($value): bool {
    }
 
    public function regex($value): bool {
-      return (preg_grep($value, $this->value)) ? true : false;
+      return (preg_match($value, $this->value) === 1) ? true : false;
    }
 
    public function isPublicFormCompatible(): bool {
diff --git a/inc/field/integerfield.class.php b/inc/field/integerfield.class.php
index 85e4c292f..006b8aba2 100644
--- a/inc/field/integerfield.class.php
+++ b/inc/field/integerfield.class.php
@@ -150,10 +150,6 @@ public function greaterThan($value): bool {
       return ((int) $this->value) > ((int) $value);
    }
 
-   public function regex($value): bool {
-      return (preg_grep($value, (int) $this->value)) ? true : false;
-   }
-
    public function getHtmlIcon() {
       return '<i class="fas fa-square-root-alt" aria-hidden="true"></i>';
    }
diff --git a/inc/field/ipfield.class.php b/inc/field/ipfield.class.php
index c16cccb8a..bc8c34264 100644
--- a/inc/field/ipfield.class.php
+++ b/inc/field/ipfield.class.php
@@ -156,7 +156,7 @@ public function lessThan($value): bool {
    }
 
    public function regex($value): bool {
-      return (preg_grep($value, $this->value)) ? true : false;
+      return (preg_match($value, $this->value) === 1) ? true : false;
    }
 
    public function isPublicFormCompatible(): bool {
diff --git a/inc/field/textareafield.class.php b/inc/field/textareafield.class.php
index 7f6c12532..0b89ddb5c 100644
--- a/inc/field/textareafield.class.php
+++ b/inc/field/textareafield.class.php
@@ -240,7 +240,7 @@ public function lessThan($value): bool {
    }
 
    public function regex($value): bool {
-      return (preg_grep($value, $this->value)) ? true : false;
+      return (preg_match(Sanitizer::unsanitize($value), $this->value) === 1) ? true : false;
    }
 
    public function isPublicFormCompatible(): bool {