Multi-repo search: How to search across multiple repositories

Multi-repo search is an essential tool for organizations with codebases spread across numerous repositories and different platforms, as it allows for efficient and simultaneous querying across all repositories. This capability is crucial for tasks such as security vulnerability remediation, code reuse, developer onboarding, and compliance audits, transforming days of manual searching into minutes of automated queries. While native search tools like those provided by GitHub and GitLab are limited to their respective platforms, dedicated tools like Sourcegraph offer comprehensive solutions by indexing repositories from multiple hosts into a single searchable index. Sourcegraph supports advanced search functionalities such as regex, structural search, and precise code navigation using SCIP indexes, which are not available in simpler CLI tools or native search options. This guide emphasizes the importance of multi-repo search in large-scale code management, comparing various approaches and detailing how Sourcegraph's unique features like Batch Changes and Code Insights can streamline code management and facilitate enterprise-level operations.