1 files changed, 37 insertions, 0 deletions
diff --git a/lib/plugins/config/settings/config.class.php b/lib/plugins/config/settings/config.class.php
index ec5f73fa5..bbb25b695 100644
--- a/lib/plugins/config/settings/config.class.php
+++ b/lib/plugins/config/settings/config.class.php
@@ -1081,3 +1081,40 @@ if (!class_exists('setting_multicheckbox')) {
     }
   }
 }
+
+if (!class_exists('setting_regex')){
+   class setting_regex extends setting_string {
+
+        var $_delimiter = '/';    // regex delimiter to be used in testing input
+        var $_pregflags = 'ui';   // regex pattern modifiers to be used in testing input
+
+        /**
+         *  update changed setting with user provided value $input
+         *  - if changed value fails error check, save it to $this->_input (to allow echoing later)
+         *  - if changed value passes error check, set $this->_local to the new value
+         *
+         *  @param  mixed   $input   the new value
+         *  @return boolean          true if changed, false otherwise (incl. on error)
+         */
+        function update($input) {
+
+            // let parent do basic checks, value, not changed, etc.
+            $local = $this->_local;
+            if (!parent::update($input)) return false;
+            $this->_local = $local;
+
+            // see if the regex compiles and runs (we don't check for effectiveness)
+            $regex = $this->_delimiter . $input . $this->_delimiter . $this->_pregflags;
+            $lastError = error_get_last();
+            $ok = @preg_match($regex,'testdata');
+            if (preg_last_error() != PREG_NO_ERROR || error_get_last() != $lastError) {
+                $this->_input = $input;
+                $this->_error = true;
+                return false;
+            }
+
+            $this->_local = $input;
+            return true;
+        }
+    }
+}
+\ No newline at end of file