A constitution is the highest legal document of a country and serves as a guide for the establishment of other laws. The constitution defines the political principles, structure, hierarchy, position, and limits of the political power of a country's government. It determines and guarantees the rights of citizens. This study aimed at topic modeling of Iranian laws. As part of this research, 11760 laws were collected from the Dotic website. Then, topic modeling was conducted on the title and content of the regularizations using LDA. Data analysis with topic modeling led to the identification of 10 topics including Economic, Customs, Housing and Urban Development, Agriculture, Insurance, Legal and judicial, Cultural, Information Technology, Political, and Government. The largest topic, Economic, accounts for 29% of regulations, while the smallest are Political and Government, accounting for 2%. This research utilizes a topic modeling method in exploring law texts and identifying trends in regularizations from 2016-2023. In this study, it was found that regularizations constitute a significant percentage of law, most of which are related to economics and customs. Cultural regularizations have increased in 2023. It can be concluded any law enacted each year can reflect society's conditions and legislators' top concerns.

This study examines the extent to which national legislation in Iran aligns with the Sustainable Development Goals (SDGs) within the framework of Multi-Level Governance (MLG). Employing a mixed-method computational approach—combining thematic analysis and topic modeling—the research explores the argumentative and content structures of legislative texts. Findings reveal partial alignment in areas such as education, health, and environmental protection, while significant gaps remain in community empowerment, gender equality, climate action, and participatory governance. From a policy perspective, the study highlights the need to revise legislative processes to systematically integrate SDG principles, establish mechanisms for assessing legal compatibility with SDG indicators, and build the capacity of lawmakers. It also emphasizes the importance of enhancing the participation of local institutions and civil society in the legislative process and recommends developing data-driven platforms for continuous monitoring of legal alignment with the SDGs. Theoretically, the study contributes to the application of the MLG framework in legal and development studies by offering empirical insights into the interplay between governance levels and legal systems. However, the research is limited by its exclusive focus on formal legal texts, limited interpretive depth of topic modeling, and its single-country scope. Future studies should explore comparative legal assessments, critical discourse analysis, and network-based approaches in other developing countries. Additionally, analyzing sub-national laws and their implementation could provide further insights into the challenges and opportunities of SDG localization.