SHACL validation tests failing on Windows due to backslash handling in regex patterns

## Description

All SHACL validation test suite tests are failing on Windows but passing on Linux. The root cause is improper handling of escaped backslashes in regex patterns within Turtle/RDF files.

## Error Message
```
Error: Validation { error: "Error when working with the SRDFGraph, Invalid IRI code point '\\'" }
```