Contributed to the symfony/symfony-docs repository by enhancing the accuracy and consistency of routing documentation. Focused on refining regular expression guidance, the developer updated routing constraints to use [0-9]+ instead of \d+, ensuring that only ASCII digits are matched and preventing unintended Unicode digit matches. This change provided clearer, locale-agnostic instructions for developers working with Symfony routing, reducing the risk of misrouting in internationalized applications. The work demonstrated careful application of PHP and Symfony knowledge, as well as attention to documentation best practices using RST. All improvements were delivered through a single, traceable commit for transparency and maintainability.