---
title: "TYPO3 Exception 1298273089"
manual: "TYPO3 Exceptions"
version: "main"
permalink: "https://docs.typo3.org/permalink/t3exceptions:typo3-exception-1298273089"
source: "Exceptions/1298273089.rst"
modified: "2026-09-16T07:39:08+00:00"
---

# TYPO3 Exception 1298273089

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## regularExpression "^\[2356\]$" in RegularExpressionValidator contained an error.

> #1298273089: regularExpression "^\[2356\]$" in RegularExpressionValidator contained an error.
> `TYPO3CMSExtbaseValidationExceptionInvalidValidationOptionsException` thrown in file
> `typo3/sysext/extbase/Classes/Validation/Validator/RegularExpressionValidator.php` in line 50.

This happens when no regular expression delimiter is used.

Correct usage:

```
/**
 * @validate RegularExpression(regularExpression="/^[2356]$/")
 */
public $someOption;
```