diff --git a/db_qbe.php b/db_qbe.php
index 135ba7ec76..e1f172a3fb 100644
--- a/db_qbe.php
+++ b/db_qbe.php
@@ -90,7 +90,7 @@ if ($cfgRelation['savedsearcheswork']) {
  */
 $message_to_display = false;
 if (isset($_POST['submit_sql']) && ! empty($sql_query)) {
-    if (! preg_match('@^SELECT@i', $sql_query)) {
+    if (0 !== stripos($sql_query, "SELECT")) {
         $message_to_display = true;
     } else {
         $goto = 'db_sql.php';
diff --git a/index.php b/index.php
index c5f74977d3..758ea62031 100644
--- a/index.php
+++ b/index.php
@@ -62,7 +62,7 @@ $target_blacklist =  [
 // If we have a valid target, let's load that script instead
 if (! empty($_REQUEST['target'])
     && is_string($_REQUEST['target'])
-    && ! preg_match('/^index/', $_REQUEST['target'])
+    && 0 !== strpos($_REQUEST['target'], "index")
     && ! in_array($_REQUEST['target'], $target_blacklist)
     && Core::checkPageValidity($_REQUEST['target'], [], true)
 ) {
diff --git a/libraries/classes/Controllers/Table/TableSearchController.php b/libraries/classes/Controllers/Table/TableSearchController.php
index 366b65698a..6ede4081f7 100644
--- a/libraries/classes/Controllers/Table/TableSearchController.php
+++ b/libraries/classes/Controllers/Table/TableSearchController.php
@@ -158,7 +158,7 @@ class TableSearchController extends TableController
                 // strip the "BINARY" attribute, except if we find "BINARY(" because
                 // this would be a BINARY or VARBINARY column type
                 if (! preg_match('@BINARY[\(]@i', $type)) {
-                    $type = preg_replace('@BINARY@i', '', $type);
+                    $type = str_ireplace("BINARY", '', $type);
                 }
                 $type = preg_replace('@ZEROFILL@i', '', $type);
                 $type = preg_replace('@UNSIGNED@i', '', $type);
diff --git a/libraries/classes/InsertEdit.php b/libraries/classes/InsertEdit.php
index 9fa2ec60b3..9b63f5f5ea 100644
--- a/libraries/classes/InsertEdit.php
+++ b/libraries/classes/InsertEdit.php
@@ -3002,7 +3002,7 @@ class InsertEdit
             'sql_query' => $_POST['sql_query'],
         ];
 
-        if (preg_match('@^tbl_@', $GLOBALS['goto'])) {
+        if (0 === strpos($GLOBALS['goto'], "tbl_")) {
             $url_params['table'] = $table;
         }
 
diff --git a/libraries/classes/Relation.php b/libraries/classes/Relation.php
index 60bfe8a967..b0fc3d8a14 100644
--- a/libraries/classes/Relation.php
+++ b/libraries/classes/Relation.php
@@ -1280,7 +1280,7 @@ class Relation
                 $key = htmlspecialchars($key);
             } else {
                 $key = '0x' . bin2hex($key);
-                if (preg_match('/0x/', $data)) {
+                if (false !== strpos($data, "0x")) {
                     $selected = ($key == trim($data));
                 } else {
                     $selected = ($key == '0x' . $data);
diff --git a/libraries/classes/SysInfoSunOS.php b/libraries/classes/SysInfoSunOS.php
index 20eabb08f1..030cee055e 100644
--- a/libraries/classes/SysInfoSunOS.php
+++ b/libraries/classes/SysInfoSunOS.php
@@ -30,7 +30,7 @@ class SysInfoSunOS extends SysInfoBase
     private function _kstat($key)
     {
         if ($m = shell_exec('kstat -p d ' . $key)) {
-            list(, $value) = preg_split("/\t/", trim($m), 2);
+            list(, $value) = explode("\t", trim($m), 2);
 
             return $value;
         } else {
diff --git a/libraries/classes/Table.php b/libraries/classes/Table.php
index 597aeb7473..8cda6158f8 100644
--- a/libraries/classes/Table.php
+++ b/libraries/classes/Table.php
@@ -526,7 +526,7 @@ class Table
             $query .= ' ' . $attribute;
 
             if ($is_timestamp
-                && preg_match('/TIMESTAMP/i', $attribute)
+                && false !== stripos($attribute, "TIMESTAMP")
                 && strlen($length) !== 0
                 && $length !== 0
             ) {
diff --git a/libraries/classes/Transformations.php b/libraries/classes/Transformations.php
index 7036d61e09..a1acfbc013 100644
--- a/libraries/classes/Transformations.php
+++ b/libraries/classes/Transformations.php
@@ -53,7 +53,7 @@ class Transformations
         $result = [];
 
         if (strlen($option_string) === 0
-            || ! $transform_options = preg_split('/,/', $option_string)
+            || ! $transform_options = explode(",", $option_string)
         ) {
             return $result;
         }
diff --git a/libraries/classes/Util.php b/libraries/classes/Util.php
index 47a1dcf86f..e0927a69ae 100644
--- a/libraries/classes/Util.php
+++ b/libraries/classes/Util.php
@@ -2894,7 +2894,7 @@ class Util
             // this would be a BINARY or VARBINARY column type;
             // by the way, a BLOB should not show the BINARY attribute
             // because this is not accepted in MySQL syntax.
-            if (preg_match('@binary@', $printtype)
+            if (false !== strpos($printtype, "binary")
                 && ! preg_match('@binary[\(]@', $printtype)
             ) {
                 $printtype = preg_replace('@binary@', '', $printtype);