--- /dev/null
+<?php
+
+/*
+ * This file is part of the JsonSchema package.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace JsonSchema\Constraints;
+
+use JsonSchema\Entity\JsonPointer;
+
+/**
+ * The StringConstraint Constraints, validates an string against a given schema
+ *
+ * @author Robert Schönthal <seroscho@googlemail.com>
+ * @author Bruno Prieto Reis <bruno.p.reis@gmail.com>
+ */
+class StringConstraint extends Constraint
+{
+ /**
+ * {@inheritdoc}
+ */
+ public function check(&$element, $schema = null, JsonPointer $path = null, $i = null)
+ {
+ // Verify maxLength
+ if (isset($schema->maxLength) && $this->strlen($element) > $schema->maxLength) {
+ $this->addError($path, 'Must be at most ' . $schema->maxLength . ' characters long', 'maxLength', array(
+ 'maxLength' => $schema->maxLength,
+ ));
+ }
+
+ //verify minLength
+ if (isset($schema->minLength) && $this->strlen($element) < $schema->minLength) {
+ $this->addError($path, 'Must be at least ' . $schema->minLength . ' characters long', 'minLength', array(
+ 'minLength' => $schema->minLength,
+ ));
+ }
+
+ // Verify a regex pattern
+ if (isset($schema->pattern) && !preg_match('#' . str_replace('#', '\\#', $schema->pattern) . '#u', $element)) {
+ $this->addError($path, 'Does not match the regex pattern ' . $schema->pattern, 'pattern', array(
+ 'pattern' => $schema->pattern,
+ ));
+ }
+
+ $this->checkFormat($element, $schema, $path, $i);
+ }
+
+ private function strlen($string)
+ {
+ if (extension_loaded('mbstring')) {
+ return mb_strlen($string, mb_detect_encoding($string));
+ }
+
+ // mbstring is present on all test platforms, so strlen() can be ignored for coverage
+ return strlen($string); // @codeCoverageIgnore
+ }
+}