diff --git a/types/WideAngleConfig.php b/types/WideAngleConfig.php
index 09d3106..7a74bc4 100644
--- a/types/WideAngleConfig.php
+++ b/types/WideAngleConfig.php
@@ -18,7 +18,7 @@ class WideAngleConfig {
 
   function generateHeaderScript() {
     $script = <<<EOD
-<link href="{$this->trackerDomain}/script/{$this->siteId}.js" ref="prefetch"/>
+<link href="https://{$this->trackerDomain}/script/{$this->siteId}.js" ref="prefetch"/>
 EOD;
     return $script;
   }
@@ -29,7 +29,7 @@ EOD;
 
     $script = <<<EOD
 <script async defer
-  src="{$this->trackerDomain}/script/{$this->siteId}.js"
+  src="https://{$this->trackerDomain}/script/{$this->siteId}.js"
   data-waa-ignore-hash="{$this->ignoreHash}"
   $includeParamsAttribute
   $pathExlusionsAttribute></script>
diff --git a/types/WideAngleHelpers.php b/types/WideAngleHelpers.php
index 606d6f2..891a174 100644
--- a/types/WideAngleHelpers.php
+++ b/types/WideAngleHelpers.php
@@ -1,9 +1,12 @@
 <?php
 include_once( $this->plugin->folder . '/types/WideAngleExclusion.php' );
+include_once( $this->plugin->folder . '/types/WideAngleValidated.php' );
 
 class WideAngleHelpers {
-
-
+  const WAA_SEPARTOR                            = "|:";
+  private const includeParamRequestKeyPattern   = "/^waa_inc_params_(\d{1,2})$/";
+  private const includeParamRequestValuePattern = "/^[A-Za-z0-9_-]{1,128}$/";
+  private const excludePathRequestKeyPattern    = "/^waa_exc_path_(\d{1,2})_type$/";
 
   function normalizeBoolean($value) {
     $trimmed = trim($value);
@@ -18,8 +21,65 @@ class WideAngleHelpers {
     }
   }
 
-  function normalizeTrackerDomain($domain) {
-    return "https://" . parse_url($domain,  PHP_URL_HOST);
+  function validateIgnoreHashFlag($name, $ignoreHash) {
+    if(filter_var($ignoreHash, FILTER_VALIDATE_BOOLEAN)) {
+      return WideAngleValidated::createValid($name, $ignoreHash, "true");
+    } else {
+      return WideAngleValidated::createValid($name, $ignoreHash, "false");
+    }
+  }
+
+  function validateSiteId($name, $siteId) {
+    if(preg_match("/^[a-zA-Z0-9]{10,24}$/", $siteId)) {
+      return WideAngleValidated::createValid($name, $siteId, strtoupper(trim($siteId)));
+    } else {
+      return WideAngleValidated::createInvalid($name, $siteId, "Site ID is expected to consist only letters and digits. It must be at least 10 character long and no longer than 24.");
+    }
+  }
+
+  function validateTrackerDomain($name, $domain) {
+    if(filter_var($domain, FILTER_VALIDATE_DOMAIN, FILTER_FLAG_HOSTNAME)) {
+      return WideAngleValidated::createValid($name, $domain, $domain);
+    } else {
+      return WideAngleValidated::createInvalid($name, $domain, "The tracked domain must be a valid domain name.");
+    }
+  }
+
+
+  function validateIncludeParams($name, $request) {
+    $params = array();
+    foreach($request as $requestKey => $paramValue) {
+      if(preg_match(self::includeParamRequestKeyPattern, $requestKey)) {
+        if(preg_match(self::includeParamRequestValuePattern, $paramValue)) {
+          array_push($params, trim($paramValue));
+        } else {
+          return WideAngleValidated::createInvalid($name, $paramValue, "Name of parameter to include in request must consint of letters, numbers and can contain _ or - sign only.");
+        }
+      }
+    }
+    return WideAngleValidated::createValid($name, $params, implode(self::WAA_SEPARTOR, $params));
+  }
+
+
+  function validateExclusionPathsRequest($name, $request) {
+    $exclusions = array();
+    foreach($request as $key => $exclusionType) {
+      $idx = array();
+      if(preg_match(self::excludePathRequestKeyPattern, $key, $idx)) {
+        $valueKey = "waa_exc_path_".$idx[1]."_value";
+        $exclusionValue = trim($request[$valueKey]);
+        if($exclusionValue != null) {
+          if(filter_var($exclusionValue, FILTER_VALIDATE_REGEXP)) {
+            $typedExclusion = "[" . $exclusionType . "]" . $exclusionValue;
+            array_push($exclusions, $typedExclusion);
+          } else {
+            $typedExclusion = "[" . $exclusionType . "]" . filter_var($exclusionValue, FILTER_SANITIZE_SPECIAL_CHARS);
+            array_push($exclusions, $typedExclusion);
+          }
+        }
+      }
+    }
+    return WideAngleValidated::createValid($name, implode(self::WAA_SEPARTOR, $exclusions), null);
   }
 
   function parseIncludeParamsSetting($params) {
@@ -30,23 +90,12 @@ class WideAngleHelpers {
     }
   }
 
-  function parseRequestIncludeParams($request) {
-    $pattern = "/^waa_inc_params_(\d{1,2})$/";
-    $params = array();
-    foreach($request as $key => $value) {
-      if(preg_match($pattern, $key)) {
-        array_push($params, trim($value));
-      }
-    }
-    return $params;
-  }
-
   function parseExclusionSetting($path) {
     $flatExclusions     = $path;
-    $exclusions = preg_split("/\|\:/", $flatExclusions);
-    $exclusionPattern = '/^\[([A-Za-z0-9]{1,10})\](.*)$/';
-    $matches = array();
-    $parsedExclusions = array();
+    $exclusions         = preg_split("/\|\:/", $flatExclusions);
+    $exclusionPattern   = '/^\[([A-Za-z0-9]{1,10})\](.*)$/';
+    $matches            = array();
+    $parsedExclusions   = array();
 
 
     foreach($exclusions as $exclusion) {
@@ -57,22 +106,6 @@ class WideAngleHelpers {
     return $parsedExclusions;
   }
 
-  function parseRequestExclusionPaths($request) {
-    $pattern = "/^waa_exc_path_(\d{1,2})_type$/";
-    $exclusions = array();
-    foreach($request as $key => $exclusionType) {
-      $idx = array();
-      if(preg_match($pattern, $key, $idx)) {
-        $valueKey = "waa_exc_path_".$idx[1]."_value";
-        $exclusionValue = trim($request[$valueKey]);
-        if($exclusionValue != null && $exclusionValue != "") {
-          $typedExclusion = "[" . $exclusionType . "]" .$exclusionValue;
-          array_push($exclusions, $typedExclusion);
-        }
-      }
-    }
-    return $exclusions;
-  }
 }
 
 ?>
\ No newline at end of file
diff --git a/views/admin_settings.php b/views/admin_settings.php
index 010424d..86366cd 100644
--- a/views/admin_settings.php
+++ b/views/admin_settings.php
@@ -31,9 +31,18 @@ $parsedIncludeParams  = $this->plugin->helpers->parseIncludeParamsSetting($this-
   <?php
   }
   if ( isset( $this->errorMessage ) ) {
+    if(is_array($this->errorMessage)) {
+      foreach($this->errorMessage as $error) {
+        ?>
+    <div class="error fade"><p><?php echo esc_html($error); ?></p></div>
+        <?php
+      }
+    }
+    else {
   ?>
     <div class="error fade"><p><?php echo esc_html($this->errorMessage); ?></p></div>
   <?php
+    }
   }
   ?>
   <div>
@@ -43,14 +52,14 @@ $parsedIncludeParams  = $this->plugin->helpers->parseIncludeParamsSetting($this-
           <tr>
             <th scope="row"><label>Site ID</label></th>
             <td>
-              <input id="waa_site_id" type="text" name="waa_site_id" pattern="[A-Z0-9]{10,24}" class="regular-text" value="<?php echo esc_attr($siteId); ?>"/>
+              <input id="waa_site_id" type="text" name="waa_site_id" class="regular-text" value="<?php echo esc_attr($siteId); ?>"/>
               <p class="description" id="tagline-description">A Site ID. You will find it in the Site Settings, in Wide Angle Analytics Dashboard.</p>
             </td>
           </tr>
           <tr>
             <th scope="row"><label>Tracker Domain</label></th>
             <td>
-              <input id="waa_tracker_domain" type="url" name="waa_tracker_domain" class="regular-text code" value="<?php echo esc_attr($trackerDomain); ?>"/>
+              <input id="waa_tracker_domain" type="text" name="waa_tracker_domain" class="regular-text code" value="<?php echo esc_attr($trackerDomain); ?>"/>
               <p class="description" id="tagline-description">A domain you selected for your tracker. You can check current domain in the Site Settings, in the Wide Angle Analytics. If you haven't set custom domain for your site, there is no need to change this field.</p>
             </td>
           </tr>
@@ -71,8 +80,6 @@ $parsedIncludeParams  = $this->plugin->helpers->parseIncludeParamsSetting($this-
                     <?php
                       }
                     ?>
-                    <option value="end"<?php if($exclusion->get_type() == "end") echo ' selected'; ?>>Ends with</option>
-                    <option value="regex"<?php if($exclusion->get_type() == "regex") echo ' selected'; ?>>RegEx</option>
                   </select>
                   <input type="text" name="waa_exc_path_<?php echo esc_attr($i); ?>_value" value="<?php echo esc_attr($exclusion->get_value()); ?>"/>
                   <button data-waa-action="remove_exclusion" data-waa-exc-path="<?php echo esc_attr($i); ?>" class="button button-secondary">Remove</button>
@@ -94,7 +101,7 @@ $parsedIncludeParams  = $this->plugin->helpers->parseIncludeParamsSetting($this-
                   $param = $parsedIncludeParams[$i];
                 ?>
                 <div data-waa-inc-params="<?php echo esc_attr($i); ?>" style="display: flex; flex-direction: row; margin-bottom: 0.3rem">
-                  <input type="text" name="waa_inc_params_<?php echo esc_attr($i); ?>" value="<?php echo esc_attr($param); ?>" pattern="[A-Za-z0-9_-]{1,128}"/>
+                  <input type="text" name="waa_inc_params_<?php echo esc_attr($i); ?>" value="<?php echo esc_attr($param); ?>"/>
                   <button data-waa-action="remove_param" data-waa-inc-params="<?php echo esc_attr($i); ?>" class="button button-secondary">Remove</button>
                 </div>
                 <?php
diff --git a/wide-angle-analytics.php b/wide-angle-analytics.php
index 14648e4..d428433 100644
--- a/wide-angle-analytics.php
+++ b/wide-angle-analytics.php
@@ -15,7 +15,6 @@
 <?php
 class WideAngleAnalytics {
 
-  const WAA_SEPARTOR                      = "|:";
   const WAA_CONF_SITE_ID                  = "waa_site_id";
   const WAA_CONF_TRACKER_DOMAIN           = "waa_tracker_domain";
   const WAA_CONF_EXC_PATHS                = "waa_exc_path";
@@ -112,32 +111,45 @@ class WideAngleAnalytics {
       } elseif ( ! wp_verify_nonce( $_REQUEST[ $this->plugin->name . '_nonce' ], $this->plugin->name ) ) {
         $this->errorMessage = __( 'Invalid nonce specified. Settings NOT saved.', $this->plugin->name );
       } else {
-        $waaSiteId = $_REQUEST['waa_site_id'];
-        $waaTrackerDomain = $this->plugin->helpers->normalizeTrackerDomain(trim($_REQUEST['waa_tracker_domain']));
-        $waaIgnoreHash = $this->plugin->helpers->normalizeBoolean($_REQUEST['waa_ignore_hash']);
-        $waaExclusionPaths = implode(self::WAA_SEPARTOR, $this->plugin->helpers->parseRequestExclusionPaths($_REQUEST));
-        $waaIncParams = implode(self::WAA_SEPARTOR, $this->plugin->helpers->parseRequestIncludeParams($_REQUEST));
+        $waaSiteId = $this->plugin->helpers->validateSiteId(self::WAA_CONF_SITE_ID, $_REQUEST['waa_site_id']);
+        $waaTrackerDomain = $this->plugin->helpers->validateTrackerDomain(self::WAA_CONF_TRACKER_DOMAIN, $_REQUEST['waa_tracker_domain']);
+        $waaIgnoreHash = $this->plugin->helpers->validateIgnoreHashFlag(self::WAA_CONF_IGNORE_HASH, $_REQUEST['waa_ignore_hash']);
+        $waaIncParams = $this->plugin->helpers->validateIncludeParams(self::WAA_CONF_INC_PARAMS, $_REQUEST);
+        $waaExclusionPaths = $this->plugin->helpers->validateExclusionPathsRequest(self::WAA_CONF_EXC_PATHS, $_REQUEST);
 
-        include_once( $this->plugin->folder . '/types/WideAngleConfig.php' );
-        $config = new WideAngleConfig($waaSiteId, $waaTrackerDomain, $waaIgnoreHash, $waaExclusionPaths, $waaIncParams);
+        include_once( $this->plugin->folder . '/types/WideAngleConfig.php');
+        $merged = array($waaSiteId, $waaTrackerDomain, $waaIgnoreHash, $waaIncParams, $waaExclusionPaths);
+        $errors = array();
+        foreach($merged as $validated) {
+          if(!$validated->is_valid()) {
+            array_push($errors, $validated->get_error());
+          }
+        }
 
-        update_option(self::WAA_CONF_GENERATED_FOOTER_SCRIPT, $config->generateFooterScript());
-        update_option(self::WAA_CONF_GENERATED_HEADER_SCRIPT, $config->generateHeaderScript());
-        update_option(self::WAA_CONF_SITE_ID, $waaSiteId );
-        update_option(self::WAA_CONF_TRACKER_DOMAIN, $waaTrackerDomain);
-        update_option(self::WAA_CONF_IGNORE_HASH, $waaIgnoreHash );
-        update_option(self::WAA_CONF_EXC_PATHS, $waaExclusionPaths );
-        update_option(self::WAA_CONF_INC_PARAMS, $waaIncParams);
+        if(count($errors) === 0) {
+          $config = new WideAngleConfig($waaSiteId->get_value(), $waaTrackerDomain->get_value(), $waaIgnoreHash->get_value(), $waaExclusionPaths->get_value(), $waaIncParams->get_value());
+
+          update_option(self::WAA_CONF_GENERATED_FOOTER_SCRIPT, $config->generateFooterScript());
+          update_option(self::WAA_CONF_GENERATED_HEADER_SCRIPT, $config->generateHeaderScript());
+          update_option(self::WAA_CONF_SITE_ID, $waaSiteId->get_value());
+          update_option(self::WAA_CONF_TRACKER_DOMAIN, $waaTrackerDomain->get_value());
+          update_option(self::WAA_CONF_IGNORE_HASH, $waaIgnoreHash->get_value());
+          update_option(self::WAA_CONF_EXC_PATHS, $waaExclusionPaths->get_value());
+          update_option(self::WAA_CONF_INC_PARAMS, $waaIncParams->get_value());
+          $this->message = __('Settings updated', $this->plugin->name);
+        } else {
+          $this->errorMessage = $errors;
+        }
       }
     }
     $this->settings = array(
-      self::WAA_CONF_SITE_ID  => esc_html(get_option( self::WAA_CONF_SITE_ID)),
-      self::WAA_CONF_EXC_PATHS => esc_html(get_option( self::WAA_CONF_EXC_PATHS)),
-      self::WAA_CONF_INC_PARAMS => esc_html(get_option( self::WAA_CONF_INC_PARAMS)),
-      self::WAA_CONF_TRACKER_DOMAIN => esc_html(get_option( self::WAA_CONF_TRACKER_DOMAIN)),
-      self::WAA_CONF_IGNORE_HASH => esc_html(get_option( self::WAA_CONF_IGNORE_HASH)),
-      self::WAA_CONF_GENERATED_HEADER_SCRIPT => esc_html(get_option( self::WAA_CONF_GENERATED_HEADER_SCRIPT )),
-      self::WAA_CONF_GENERATED_FOOTER_SCRIPT => esc_html(get_option( self::WAA_CONF_GENERATED_FOOTER_SCRIPT )),
+      self::WAA_CONF_SITE_ID                  => get_option( self::WAA_CONF_SITE_ID),
+      self::WAA_CONF_EXC_PATHS                => get_option( self::WAA_CONF_EXC_PATHS),
+      self::WAA_CONF_INC_PARAMS               => get_option( self::WAA_CONF_INC_PARAMS),
+      self::WAA_CONF_TRACKER_DOMAIN           => get_option( self::WAA_CONF_TRACKER_DOMAIN),
+      self::WAA_CONF_IGNORE_HASH              => get_option( self::WAA_CONF_IGNORE_HASH),
+      self::WAA_CONF_GENERATED_HEADER_SCRIPT  => get_option( self::WAA_CONF_GENERATED_HEADER_SCRIPT),
+      self::WAA_CONF_GENERATED_FOOTER_SCRIPT  => get_option( self::WAA_CONF_GENERATED_FOOTER_SCRIPT),
     );
     include_once( $this->plugin->folder . '/views/admin_settings.php' );
   }
@@ -155,32 +167,13 @@ class WideAngleAnalytics {
    *  - waa_footer_script
    */
   function registerPluginSettings() {
-    register_setting( $this->plugin->name, self::WAA_CONF_SITE_ID, array(
-      'sanitize_callback' => 'trim',
-    ) );
-    register_setting( $this->plugin->name, self::WAA_CONF_EXC_PATHS, array(
-      'sanitize_callback' => 'trim',
-    ) );
-    register_setting( $this->plugin->name, self::WAA_CONF_INC_PARAMS, array(
-      'sanitize_callback' =>'trim',
-      'default' => ''
-    ) );
-    register_setting( $this->plugin->name, self::WAA_CONF_TRACKER_DOMAIN, array(
-      'sanitize_callback' => array(&$this->plugin->helpers, 'normalizeTrackerDomain'),
-      'default' => 'https://stats.wideangle.co'
-    ) );
-    register_setting( $this->plugin->name, self::WAA_CONF_IGNORE_HASH, array(
-      'sanitize_callback' => array(&$this->plugin->helpers, 'normalizeBoolean'),
-      'default' => 'false'
-    ) );
-    register_setting( $this->plugin->name, self::WAA_CONF_GENERATED_HEADER_SCRIPT, array(
-      'sanitize_callback' => 'trim',
-      'default' => ''
-    ) );
-    register_setting( $this->plugin->name, self::WAA_CONF_GENERATED_FOOTER_SCRIPT, array(
-      'sanitize_callback' => 'trim',
-      'default' => ''
-    ) );
+    register_setting($this->plugin->name, self::WAA_CONF_SITE_ID);
+    register_setting($this->plugin->name, self::WAA_CONF_EXC_PATHS);
+    register_setting($this->plugin->name, self::WAA_CONF_INC_PARAMS);
+    register_setting($this->plugin->name, self::WAA_CONF_TRACKER_DOMAIN, array('default' => 'stats.wideangle.co'));
+    register_setting($this->plugin->name, self::WAA_CONF_IGNORE_HASH, array('default' => 'false'));
+    register_setting($this->plugin->name, self::WAA_CONF_GENERATED_HEADER_SCRIPT);
+    register_setting($this->plugin->name, self::WAA_CONF_GENERATED_FOOTER_SCRIPT);
   }
 
 }