Merge pull request #33 from bolt/feature/is-valid-regex

Add `Str::isValidRegex` test
bolt · Feb 4, 2021 · fd85000 · fd85000
2 parents 3c5833a + 91b3e57
commit fd85000
Showing 1 changed file with 11 additions and 0 deletions.
diff --git a/src/Str.php b/src/Str.php
@@ -622,4 +622,15 @@ public static function cleanWhitespace(string $str, string $charlist = " \t\n\r\
     {
         return trim(preg_replace('/[\t\n\r\s]+/', ' ', $str), $charlist);
     }
+
+    /**
+     * Tests a string as a Regular Expression (regex)
+     * @return bool true if valid.
+     */
+    public static function isValidRegex(string $regex): bool
+    {
+        @preg_match($regex, '');
+
+        return preg_last_error() === PREG_NO_ERROR;
+    }
 }